Unfortunately we didn't meet Anna during our stay but the communication was flawless and we had a lovely time getting to know Jan and talking with him.
The room is simple but clean and quiet with a comfortable bed and a great shower. The house is in a quiet street, 7 minutes walk from the underground station (to Central Line), which made all our transportations to the different parts of the city very easy.
We would love to stay at Jan and Anna's place again whenever we go back to London.