Our experience at Bea's house was great, even better than we expected. It's a very comfortable house, equipped with all the essentials, with a great location, very quiet. Even the neighbours (the ones we met) are friendly :-). The only perk are the very steep stairs — at the end of the day, after long walks in London, climbing up to the fourth floor is no easy task.
The location is great: very close to the subway station (where you have two main lines — Circle and Central, as well as the Jubilee, to take you to all the main attractions). There are also a few bus stops very close (for instance, you can take the 70 from South Kensigton and it will leave you "at the door"). There are also some very handy stores nearby (Tesco, Marks & Spencer, a Waterstones, a few bakeries — the best is Paul Rhodes — a record store, etc), not to mention, of course, the whole Notting Hill neighbourhood. Also very nice is the Farmer's Market (on a neighbouring parking lot) on Saturday mornings.
Bea was very helpful and understanding about everything we asked.
You will love it.