The flat in Pimlico is nice and central, and as shown in the photos. The bathroom is modern and clean and even though it's a shared arrangement, I had no issues.
I had a lovely stay and really enjoyed the location; you can get the 24 bus to most central locations or Victoria Station (10 mins walk) or Pimlico (7 mins walk) are both easy to get to. Pimlico shops and restaurants are just a few minutes walk.
Alessandro, the host was prompt in communicating and left some supples to start you up...cereal, drinks etc, which is a nice touch.
It was nice to be in a flat and be independent. The only thing is the flat is up 4 flights of stairs and I would advise against it if you have a heavy suitcase or difficulty with stairs (particularly after a long day sight seeing).