Bernie's place was perfect for our stay. There was three of us in the flat and there was plenty of space. It's a basic basement flat in a good location, for a decent price.
There was a lot of noise in the mornings from the flat upstairs, such as footsteps, voices and like cutlery being put away, but we were kind of expecting that.
The thing that we all found a bit weird and unexpected was the lack of privacy in the bathroom. There is a glass wall from the kitchen to the bathroom, which kind of obscures everything but not really. So whenever anyone had a shower, the rest of us couldn't really go in the kitchen. The bathroom door is frosted glass, but has a big 'peep hole' of normal glass that looks right into the toilet. This didn't really affect our stay, but it was just a bit odd, and meant we had to announce when we were using the bathroom.
Overall Bernie's flat did the job and met my expectations of a cheap place to stay in London.