Firstly, location is great! 10 minute walk from Borough market, Tower bridge and Tower of London. 2 metro stations close by, it took us maximum half an hour to get anywhere. Nadim and his sister were excellent hosts, anything we needed Nadim would come by in half an hour and take care of it, and he gave us excellent tips before and on our arrival about which places, bars to visit in London.
The room my girlfriend and I had was nice and reasonably large if you mainly want to sleep there and spend the rest of the day outside. Everything was really clean, and even though we shared the flat with 2-5 more people throughout 4 days we stayed there. We did not have problems with having only one toilet and one bathroom. The only bad side is that all the rooms look over very busy street, so it is very noisy during day or night, especially if you're there in the summer and need to keep the windows open. However my suggestion is to just provide some ear plugs to the guests and problem solved :) Overall, would recommend. Thanks Nadim!