The apartment was clean and tidy, but substantially smaller than advertised, as it appears the 35 sq meter size includes a lengthy corridor. There is barely space to move around the bed when it's down, and opening the windows is difficult given that they're single opening secondary glazing. There isn't any air conditioning, making the apartment oppressively hot in temperatures around the mid 20's C.
The local area is great for food and getting around London, however the down-side is that it's also and therefore noisy at night - even with all the windows and secondary glazing closed you can hear constant noise, and closing them makes the room even hotter at night.
Whilst the Wi-Fi was free, it consistently ran at around 1Mbps, making web browsing painful and video streaming unusable.
For the same money or less, I'd advise looking at managed apartments - some with front desks and breakfast offerings - about 1 - 1 1/2 miles out of the city, South of the river. Much better value for money.
If you do choose to go ahead with the booking, make sure that you check all the details in the incoming emails, as you have to email over photo ID and pay an additional deposit, which isn't clear and will prevent you from getting into your room on arrival, which can be disconcerting if you arrive at night.