The flat and Caroline were faultless, it was very easy to check-in using the lockbox and clear instructions with photos were provided with everything needed.
The flat is very stylish and well stocked and was a very comfortable stay, the balcony has great views of the City of London and Canary Wharf and all the rooms were well sized. The immediate area of the flat, in Walthamstow, wasn't particularity nice, but there are nice areas not a million miles away, so it was all good.
Overall a very pleasant stay with no complaints.