We had a lovely stay at The Secret Cottage.
Very easy to drive to from south london and easy to find. The location also had good access to nice walks and Amanda kindly gave us some reccomendations. The land is away from the road and private (although it is next to one other cottage - owned by the same hosts I believe).
The Cottage is very warm and cozy (we loved the under floor heating!). It is beautifully designed and manages to pack everything in that you need. However, I would say the space is only really comfortable for 4 adults max (there were 5 of us which made it a bit tight).
Amanda was a great host, she came to welcome us and replied quickly to any questions we had.