We were two adult (40yo) couples and stayed for 4 nights.
The apartment is modern and well decorated. It has everything you need for a nice city holiday. Everything was clean and tidy.
The Kitchen is well equipped and organized, the two bedrooms are clean and cozy, and the living room is nice and relaxing.
The bathroom is pretty spacious and lots of hot water (which is important in the cold London weather).
Location - the apartment is located between two Tube stations (about 6 minutes walk from each of them) - so it is comfortable and fast to get to the different city centers.
The only thing I can argue is that the towels could use a renewal and the mattresses in the bedrooms could use an upgrade.
The host (Alex) provided us clear and accurate instructions how to check in and out, and was very responsive and helpful during our stay.