The flat is in an excellent location. It particularly suited us well for driving to the outskirts of London with young children (and all the gear required). There was no problem finding parking for the car, the neighbourhood felt safe and transportation is very convenient.
Malden Manor station is literally across the street and a direct shot into Waterloo/Vauxhall and therefore easy to branch out into the rest of London. A change could be made at Wimbledon from the overground to the District for the Natural History Museum if needed.
The flat has the rooms as advertised...it was useful to have separate rooms for each of the kids. The bathroom is split into toilet and sink/shower rooms which helps with the morning traffic. The kitchen is well equipped.
There is a sufficiently stocked Coop across the street next to the station with basics (and good stock of kids' medicines if needed) as well as a chemist in the shopping plaza further left on the roundabout. There is also a fish and chips and Korean takeaway (tried the latter, it was good) if you just want to pick something up at the spur of the moment.
There is also a nature trail along the river and playground behind the flats. We did not notice this until our last day (but had spent most our time in London, so would not have made use of it in any case.