I stayed at Daphne's house for a conference at the Excel Exhibition Centre which is 10 minutes of travel time (time walking to the station and time on the train) or 20 minutes of walk away. It is very convenient.
For those who are looking to travel to central London often, it takes around 30 minutes from Daphne's house.
Daphne and her son, Daniel were really helpful - they answered all my questions and provided assistance with my luggage and laundry needs.
The size of the room is, exactly as described, very small but it has a TV and two cupboards for storage space. The kitchen is equipped with tools for cooking, washing machine for clothes and a heating rack for drying clothes. It's also in a quiet neighborhood.
All in all, all the things you need for a comfortable stay.