Our staying at Asha's house was great.
Asha and Denis are super kind and they answered all our questions quickly.
The house is very nice and spacious, it has a full equiped kitchen, wifi and all facilities you would need either for a short or long stay. We really liked the living room and the back yard (we even saw a squirrel there).
The location is also very good, it is about 10 minutes walking from the subway which connects Heathrow airport with the city center.
We would like to repeat soon!