Overall great, and would probably stay again at the same price. Other reviews mentioned noise, and I'd have to agree that there is quite a bit. I presume because the building is basically a stack of steel boxes, the rumble of passing trains travels easily into it. That said, if you're a city dweller used to traffic noise I doubt it would bother you unduly. I personally did find it a problem, and if I go back I'll be taking ear plugs!
All that said there's a huge amount to like about the place. The design is really clever, with a proper 6-foot wide (and very comfortable) bed at one end of the room. The use of space is excellent, and it never feels cramped.
The kitchen wouldn't be much good if you were planning a full self-catering holiday, but ideal for a night or two if you want to save a bit of money and eat in your room. The microwave with grill is decent quality and surprisingly useful, and there's a enough in the way of plates, knives etc to make a decent fist of cooking your own food. Also appreciated that there's a sponge, washing up liquid and a teatowel provided.
The bathroom is also very smart, and things like the automatic lights are a neat touch.
A couple of final things to add: first, there was a stack of tea and coffee sachets waiting, which was nice and not mentioned on the listing. And second, the listing says 'coffee maker', but I think it just means 'kettle', because that's what you get!