The flat is very nice and confortable. Everything was clean and working properly. I needed a cot and a highchair for my daughter and Robin bought new ones for my stay. That was really nice and helpful. I think that what you get is exactly what you see in the photos. The only complain I have is about the internet, because it didn't work well during my stay. It lost connection very often and was a bit slow.
The nearest tube station is Earl's Court (5-7 min walking if you take a shortcut).
The area is surrounded only by private gardens. The nearest open space was the Kensington Gardens (10 min walk). The playground in the Holland Park was a 15 min walk, which was a little frustaring when traveling with children. However, the museums compensate that absense.
The High Street Kensignton has many interesting shops and is only a 8-10 min walk.
I had a great time and I recommend the flat and the host.