I really liked my stay at Mary's house (it was two weeks). Even though the check-in time was at 6pm, Mary arranged everything and a friend let me in a lot earlier. I arrived earlier than I expected (at 3pm) and it was really nice to be there after a long journey from Poland (I set off at 7am).
I felt really comfortable at Mary's house. Mary offers tidy accommodation with everything you need. The house is fully-equipped. You'll find anything you need for cooking and doing the laundry. The house even has a little garden. The house rules are sensible and easy to follow.
The house is in a quiet street and it's close and easy to get into the city centre by public transport (it's 2nd zone). It's also close to supermarkets (I did my shopping at Sainsbury's, just two stops away). Brixton itself is a nice and safe neighbourhood.
Mary is a great host, very hospitable, friendly and helpful. She lent me her pass to the Tate Britain so I could see Van Gogh's exhibition for free.
If you want to have a good time in London, you should stay at Mary's house in Brixton.
Jurek from Poland