Serena is a wonderful host. She is very attencious and will give you loads of tips about places you can go.
I've spent one week at her flat, it's very confy and clean. The bed is amazing!
It has a very good location. Very near the underground (2 minutes walk I think) and a bus station just across the street. You can also find a Tesco at the area witch is very conviniet.
The flat is just as she described in here and I felt like it was at home.