I am renting out my room in a three bed-room apartment in beautiful St.Johns Wood close to regents park. My Flat mates are both male students aged 23/24
The room has 1 double bed (140x200) and also has an extra mattress that can be used (135x190).
The Room is about 14 sqm (decent size for London) and can fit 2 people comfortably and more semi-comfortably ;)
I dont charge a cleaning fee so I expect both to leave a clean room/apartment behind and to think about the saved money when encountered with an uncleaned dish.
I will of course have the apartment cleaned professionally once a week