One star deducted because there were a small number of essentially trivial issues that we discussed personally with James, most of which were resolved while we were there. I think that the "AirSorted" team may have let you down by not looking beyond their checklist. The keyed deadlock really does need to be investigated.
The location is really handy to Clapham Junction railway station - less than 50m. There can be passer-by street noise - but you're centrally located so that will not surprise anyone.
Waitrose around the corner and Sainsbury's Local at the station. Plenty of bars and restaurants in the immediate area.
The layout of the flat is really good with large well proportioned rooms. A small private courtyard is a welcome bonus - I noticed a BBQ but did not use it.
There is a washing machine and separate dryer.