As I'm on holiday and didn't have to get up this morning, I went to the Dome last night.
The class: I skipped the class. It was on musicality, given by Damian Lobato. He and Kicca are the regular teachers there, and I've taken one class with them before, but it was a long time ago and all I remember is that she's really sharp and takes the trouble to give detailed advice to the followers.
What I thought of the DJing: Perfectly standard. It was in sets, and not chaotic. No cortinas. Lots of good tunes, all of it made me want to dance more than not, nothing electronic or unusual, a few of my favourites, quite a lot of milongas, no wierd or disturbing juxtapositions. I don't remember there being a single vals, curiously. The DJ, according to the website, was Jorge Vacca.
Layout and atmosphere: Some of the seats are a bit dangerous as there's no boundary to the dance floor, but there are quite a few places where you can stand or sit down safely, there are two exits from the floor area, and it's not too difficult to move about. The raised platform, where I think they usually put tables, gives you a great view. The bar is separated from the dance floor by a low wall with openings. Everyone was pleasant and cheerful, including the bar staff. The only problem last night was the total absence of anywhere to hang your coat: everything went in an enormous pile, like a giant bedroom at a house party. Retrieving my stuff in the darkness was a challenge. Maybe this is usually better and it was just because of the crowd and the party food and whatnot.
Hospitality: Good. On this occasion it was the Christmas Party so there was lots of free food, which is a very friendly gesture. I'd already had my dinner so didn't have any myself. No water except at the bar, but the bar prices are not outrageous, I didn't notice anything explicitly forbidding you to bring your own, and all the taps work. [Edit: Anonymous in the Comments tells me there is free water in plastic glasses at the bar: they don't make this apparent, but now that I know it raises the 'hospitality' rating from OK to Good.]
Floorcraft: I had surprisingly few bumps considering the very dense crowd. They were mere touches, and neither my feet nor my hosiery were in serious danger. I think good dancers, and dancers who at least give a high priority to not kicking anyone, were a high proportion of the total, so that the hazards and the crowd didn't cause too many problems. I don't know if this was representative, it could have been just the result of who was there to see the performance. [Edit: it seems to be representative, see Comments]
Dances: I saw a lot of faces I knew but I also got some good ones with leads I hadn't danced with before, or not more than once. There were lots of good people to choose from and the layout makes it easy to watch and find people. Then it tailed off as it got more crowded. I'm sure it would have gone well if I'd been able to stay later, but I'm not fond of the night bus thing.
Anyone or anything interesting that turned up or happened: There was a performance by Gustavo Naveira & Giselle Anne. They were magic. They're very playful - in particular they play around with the embrace, and when you watch them you feel that they always have a connection, but sometimes it's just with the eyes or even the feet. Their feet are magic too. It's spectacular to watch, but it doesn't feel at all contrived or stagey - it feels like the real thing. Very compelling. They're on tour, and they'll be at the Welsh Centre this Friday and at the Crypt on Saturday (always close your eyes for the first 3 seconds looking at that website, till the animations have finished whooshing). I know at least one person who videoed it all but I don't know what he's going to do with it yet.
Getting there and getting home: It is just round the corner from Tuffnell Park on the Northern Line. Walk down the left hand side of the pub and look for the "Dome" sign. Last train from Tufnell Park to Euston is at 00:13. There are buses 4 (last one around 23:55), plus the N20, 134, and 390 which are all 24-hours and will take you to interchanges such as Camden Town, Warren Street, and Trafalgar Square where you can probably find another bus home.
Admission: Wednesday nights, normally £6 or £9 with class, this night £10 because of the performance. Open till 2am.
Website: Neither pretty nor consistent, with particularly bad navigation from the home page, but generally does the job, and does include all the information you need somewhere, including pictures of the cast, which is something most people don't do. The Special Events page does not get updated - unless Gustavo and Giselle are not a 'Special Event' - but the Monthly Programme (which is hidden a level below "Milonga") does. The Location page is correct and helpful and includes map and buses. Style about 1997, with intermittent frames.
I had a good time and would definitely go again, if I could do so without struggling at work the next day. However, I'd probably take a big, brightly coloured kitbag because of the fact that there's nowhere to hang your stuff. I was glad I'd tied it all together with my scarf and put my gloves in my shoe bag, or I'd never have been able to turn myself back into a sufficiently hairy caterpillar for the below-freezing wait at the bus stop.