Isaac is an awesome host! He's very warm and welcoming and was ready to help out whenever we had questions :) The neighborhood is not too bad, just a little scary at night because you need to walk through a narrow road to get to the other side, but kids are playing in the courtyard during the day. As for transportation to the place, it's a bit long: if you're coming from the airport, you get off at Croydon and then take a bus (outside the train station). Then once you get to your stop, it's about a ten to fifteen minute walk to the place. So just take that into account when you need to get back to gatwick airport (otherwise, taking an uber to the train station is also a good option if you have a 6am flight :'))
The room is very basic and doesn't have a lock, but we felt safe anyways. There's a sink in your room, but you'll use the communal toilet and shower. The wifi is good and the kitchen is very well equipped! Overall, very nice stay if you're visiting London or the area!