I've been in London with 2 friends and we stayed at Jocelyn's.
He and his wife, Linda, are wonderful hosts.
On the day we arrived, we got a little bit lost and when we called Jocelyn he came after us and drove us to the house.
The room was clean, the bathroom and kitchen as well.
The whole house is nice and clean.
The breakfast was more than we expected.
Location is good, it takes about 30-40 mins to arrive to Victoria station (by train).
The only bothering thing was the shared bathroom (with guests from other rooms). Sometimes we had to wait a lot to take a shower.
Anyway, I really enjoyed my staying and I recommend this place to all who want to visit London and have a limited budget.