I stayed for several weeks while I was working in London. Angela is a fantastic host, and the summer house became a real home away from home.
I loved the independence of having my own space and entrance, and the summer house is quiet and warm. It's spotlessly clean, modern and there was always fresh milk in the fridge, and plenty of real coffee.
There are skylights over the bed which might bother some - but I rather enjoyed waking up to seeing blue sky and trees!
The location might be out of the center, but the walk from the tube is very manageable, past lovely parks and some wonderful street murals.