Firstly, she is very very sweet person. Her home is very very convenient only 3 mins walk from the subway (tube). If you come from LHR you only pay no less than $6. she will give you the directions only take 50 mins.
She also gave us a tour guide around London. Definitely worth it. Her place is perfect location for who travel to London. Her price is much cheaper compared to the others host.
You can cook at her kitchen as long as you clean it.
I will definitely come back and stay with her if i have chance next time.