If you are on a budget and are going to stay a short period in London, staying the majority of the time out, then go for it.
The apartments facing the backyard are silent by night, but at 7h30 am the construction site begins all the noise that lasts until 16h30, during weekdays.
Unfortunately, Boris wasn't in the country for the first 20 days of my 1 month's stay, and neither his cleaner nor his daughter were aware of the cleaning arrangements (once per week, but I only had the apartment cleaned twice, being the first time after almost two weeks) or the laundering machine use (I was told I could use it once per week and his daughter wanted to charge me 10£ for its use). When I arrived, I noticed the shower handle was broken, I let Boris know immediately and he told me someone would go to my apartment on the following day to fix it... but a man only showed up to install a new handler 8 days later, meanwhile I had to tie the handler with my watch so it would be kept in a position I could shower.
Also, it is advertised that the apartment has condiments and spices (salt, pepper) so you can prepare your food, but there weren't any condiments, nor oil. I might thank Boris, though, for his daughter gave me 5 bags of tea on my first night.
Plus, the cleaner is extremely rude. When I asked her (during the first week) what was the day of the cleaning because the apartment had a funny damp smell (every time someone uses the toilet on the upper floor, it is possible to listen to a leak on the bathroom ceiling, that is filled with mold stains), and also how I could get new litter bags (I wasn't aware that they were kept inside the litter), she answered me that it wasn't her problem and she kept postponing the first cleaning. And she was cynical enough to tell me I should clean the apartment because it was smelly when she cleaned it (even though there wasn't any cleaning tool in the room except for the dish soap and a tiny sponge for the dishes... I didn't even have a kitchen cloth, which I had to buy at the supermarket).
And to end it, on Friday, March 4th, I met the cleaner at the hall, she said: "today inspection. understand? inspection" (which consisted in her entering the room, looking at the bathroom and the room and not saying what she found). I told her I was going to have a shower and, after that, I would call her and she could come and inspect. What wasn't my surprise when 15 minutes later, I was showering and started to hear noises coming from the room... I got out of the shower naked to find her inside my room, with the door and the window completely open, starting to clean the sink. And I had to firmly insist that she should leave because I was naked and needed to, at least, put some clothes on... That was an unacceptable violation of my privacy and she didn't even apologise for that.