Gladys' place in Croydon may be a bit of a distance from Heathrow Airport (about 1h car ride, 2h by tube/bus), but it allowed us to see parts of (South) London we otherwise would've been unlikely to see.
The house and rooms are clean and maintained regularly by Gladys, and she's always available for a chat or to give advice about London living or even travelling to other parts of the UK. She even took care of us as one of us fell ill due to a tummyache.