The apartment is pretty much brand new, in great condition, and in a great location. It was quiet and private, and had good facilities (e.g. washing machine, full set of crockery, cutlery, pans, knives).
Covent Garden was a 10 min walk, and there were tube and train stations very nearby, taxis on every corner. But it is so well located we walked almost everywhere.
The arrangements were a bit confusing at first, but when I contacted the owners directly they explained everything and couldn’t have been more helpful. Especially as it was me being dumb!