We went there march 2017 and it was the most perfect holiday I ever had.
We took an early flight from Germany so we were in London early in the morning but they made everything possible, that we could already put our suitcase and everything in the apartment while they were cleaning it. We got a call a little bit later that the apartment is cleaned and we can get inside. Excellent service.
It was super comfortable to stay there for a week. I wish I could have stayed longer :D
The transport into the city takes a while but still easy as you have everything nearby.
The only thing missing was a toilet brush.