The flat is very large for the money - 1 large double bedroom, one small box room (a child's bedroom), a kitchen, bathroom and utility cupboard with washing machine and a large reception room with sitting room arrangement at one end and a dining room arrangement at the other end. The flat is on the fourth floor, and has beautiful views of the gardens from all windows. The standard of fixtures and fittings is quite basic, the bathroom could do with some modernisation and redecoration, but the flat is comfortable, homely and quiet. The location is fantastic - five minutes' drive from Wimbledon village, and in the other direction the A3 is a few minutes away. Wimbledon common is directly opposite if you like a walk.
Stefan was helpful and reasonable. He was on holiday in Bulgaria but replied to messages promptly.
Overall: don't expect anything too luxurious, but you get a lot of space for the money, and given the price and location I would recommend it.