Me and my Girlfriend stayed at Giovanna's place about a week ago and we had a great time while we were there.
Giovanna is a super friendly and welcoming host and even provided us with tips and recommendations for restaurants and shops in the area. The room itself and the ensuite bathroom were nice and clean. We could use the big and well equipped kitchen aswell as the little garden.
I would highly recommend this accommodation to anyone planning a trip to London.