We had no direct contact with chima, but they asked if everything ok with us (via airbnb).
You could arrived in five minutes to the underground, a street further is a supermarket with enough choice.
The accommodation is very centrally located, if one goes out from the apartment you can see the Tower Bridge.
But ...
About us it was very loud every day.
I wish for Chima that it is a bit cleaner, there were lots of hair and the dust not missing.