I had an excellent stay with John and Karen! I was in the room with private bath - the bedroom was very cozy and had a bed, desk, mini fridge, tv, and coffee maker. I liked the contactless check in process too as you won't need to arrive right when the hosts are home.
John and Karen are both very nice, pleasant, and appropriately attentive to guests, even providing suggestions for food and attractions in the neighborhood.
Speaking of, despite it's distance from the city center and residential focus, Colindale is easily accessible by tube and bus and has lots of great food and drink close by. It also feels very safe.
This was my first experience with Airbnb, and I couldn't have asked for a better one. I would definitely choose to stay here again!