I stayed a couple of nights with Melissa while in London for work. I’m a frequent AirBnB-er and I can comfortably say that Melissa’s is up there with the best I have used. Melissa’s house is lovely and the room(s) were great value; at the price I normally pay it was extremely rare (and welcome) to have a separate living space and en-suite. In addition, Melissa was a lovely, generous host with a lovely home. I had a very relaxing time.
Melissa’s place is in Morden, at the end of the Northern line so is maybe a 20-25 tube ride to London-proper. The house itself is in a residential area a decent walk from the station so probably wouldn’t suit people looking for a party.