Pros: Nice, secure flat in a great location. In zone 1, so travel is easy to all the major tourist locations via the tube. The flat is well equipped and comfortable. Cons: The flat does get warm during the summer and open windows are necessary, but there is a lot of train noise. Bring earplugs if you are a light sleeper. Also, the bathroom is a little run down. Some of the fixtures fall out (door handle, towel holder); the shower grout and wall is old and mildewy/peeling; and the bathtub itself is rather treacherous to navigate--the tub is narrow and there is a step up to get in. It's pretty slippery and there isn't a handle or grips on the bottom of the tub to help. Probably wouldn't work for older/infirm guests.
Overall: a good place to stay if you're looking for a great location, basic comforts plus a few extras (having a washer/drier was great!) the price is also good for the area!