We stayed for one night at Peter's flat and it was exactly what we were looking for: well located, affordable and quiet.
The flat itself is basic but for the price it's really hard to beat, and we spent all day outside anyway. The bathroom is on the small side if you're not used to European dimensions, but for a quick stay it does the job, and the shower has good water pressure, not always a given in London! The bedroom is well sized, with a decent bed and lots of storage.
Since we had less than 24hrs in London we really wanted to be in a central location, and this is where the flat really shone, with Covent Garden/Soho and much more within walking distance, not to mention the British Museum just a stone's throw away. Despite this the street itself is very quiet.
Peter was very quick in replying and answering any queries. If we ever pass through London we'd love to stay at his place again.