Gary's apartment was an excellent stepping off point/base camp for our 10 days in London. Clean, modern, quiet, and decently outfitted. We made good use of the little kitchen. It gave us considerable flexibility in morning/evening schedules.
Croydon is a bit out of London itself, but the daily trains into Victoria and London Bridge made getting in and out of the city pretty straightforward and the bus stop to East Croydon rail station is at the front door. We concluded that grabbing a taxi when toting luggage would have been a better choice than the bus/walking. We found the unit a very good value vs. staying in London proper, but do make sure to plan for the transportation expense and time.
Gary runs a number of units and we were a little disappointed that communication was somewhat impersonal over the AirBnB app. Pre-arrival questions weren't responded to and we didn't get much of the "local" connection we look forward to with AirBnB.