The room at Dennis's is just as you can see in the pictures. Very clean, very neat. I loved staying in a real "london house". Dennis was punctually waiting for me at check-in time and he took the time to show me the room, explain to me how everything worked, etc. The he sat with me in in living room and explained me everything about Brixton and the neighborhood. Restaurants, cafés, pubs, site seeing, etc. Very helpful and complete.
Regarding Brixton, I really enjoyed the place. Very "Londonian" without so much tourism and a lot of places to go and see. And, only four or five metro stations from Victoria.
Definitely a very nice place to stay!