We spent a very pleasant week in Stephen's flat, which was exactly as described. The bed is very comfortable and the area very quiet. Stephen obviously walks quicker than us, but the underground stations and buses are close anyway.
Make sure you buy an Oyster Card, it is excellent value, and what you don't use is refundable. Via Gatwick, buy a ticket on line for the Gatwick Express to Victoria, and then a taxi to Stephen's.