1 room of 20m² in London

I am 52 years old. I have hosted students in the past and I am currently hosting a 27 year old student from Brazil he is leaving mid August...in addition..I will have a larger room also available in September.I would like to host only adult students or tourists. I am willing to add meals when required for an additional cost.I don't do special diets unfortunately, so if you can eat all foods especially carribean you can be fed!