Daria is a very responsive host. The unit is small, well laid out and functional. I stayed there by myself and it was enough space, it would be tight with two people.
The building itself is older than it looks in the picture, there are hundreds of units in the building, and the long term residents are interesting characters.
Elevators took a while, I only used it to go up and down with the suitcase, the rest of the time I took the stairs.
All that said, the location is absolutely amazing and it is easy to get anywhere in London by tube or even walking. Lots of shopping, museums, Hyde Park, coffee shops and restaurants walking distance. That was a huge plus.