We stayed at Jack & Jennie's for 2 nights. Overall, the bedroom size is great and that's where the good points end. The shower was dirty and had mold growing, the kitchen was not well equipped (lacked basic spachelor and oven gloves) and the microwave was very dirty. Also the surrounding of the flat is very noisy at all times and you can hear everything from inside and outside the apartment. We were woken up at 7AM by the host as they banging doors, drying their hair and not considerate at all. Even ear plugs didn't help, If you are a light sleeper, avoid.
Overall it is an average room that does the job. You get what you pay for in London and it is not much apparently.