We really enjoyed our time in London and this was also because Valentina's place is very nice. The room is big enough (we were 2 adults and 2 kids) and comfortable. The kitchen and the bathroom are big as well. The apartment is close to the sub and a supermarket. Unfortunately we didn't had much time to know Valentina and Michael but the small time spent with them was nice. The instructions and recommendations they provided us were quite useful.
I definitely recommend to stay there and we will book this place next time we go back to London.