We stayed at Kevin's place for a couple weeks. We were here for the record 40° heatwave. Luckily he has blackout shades and it's well insulated!
The good:
* The flat. The photos don't do it justice. The layout is great. It was my wife and I, both working from home, plus our 16 year old son. We didn't feel crowded at all. The balcony especially is much nicer then it appears in the photos on AirBnB. It's 2 or 3 times as large as it appears in the photos - basically an entire extra room. The flat is an "L" shape and the balcony fills in the corner of the L. It's wonderful in warm weather.
* The location. The building is on very low traffic street. It's in-between two pedestrianized zones, so the only cars on the street at ones going to the building itself, and the ones going to the hotel across the road. You can walk to the flat from Kingston train station in about 3 minutes without every leaving the sidewalk. You can get to the river in a minute. City centre in under 5 minutes. x26 bus to Heathrow is right by the train station, 65 bus to Richmond is right down the street, and Sainsbury's is just 30 seconds down the road.
If you're a cyclist Richmond park is just a few minutes away and can't be missed. Box Hill is 90 minutes, but another can't miss ride. On weekend mornings there are literally hundreds of cyclists riding by.
* The kitchen, washer, dryer, tv, shower, beds were all great. Kevin also has two drying racks on the patio. There aren't a ton of spices and stuff, but there are plenty of dishes, pots, and pans so that you can cook from home and not have to go out to restaurants every night.
The bad:
* The flat is in a high density residential area. It is not quiet. We were there during school holidays. The flat is well insulated and the windows are double paned, but if it's warm and you need to keep them open you will hear a LOT of noise. Screaming kids, parties that go until 4am, planes overhead taking off from Heathrow. MOST of the time it was fine. Sometimes it was a bit much.
* Wifi is great during the day (again, my wife and I worked from home). But about 17:30, 18:00 people start getting home from work and it slows to a crawl. I had a late meeting one night and couldn't use video. My son tried to play Xbox and couldn't even get online. We just switched to use our phone mobile data at nights.
That said, we enjoyed our stay and were sad to go.