Alton is very welcoming and helpful (good places to see, luggages, ...).
We only saw Alton on the 1st day because of our schedules but you knew we could call him if we needed too.
The room is comfortable, secure and you have all the space you need.
The kitchen is small but has everything.
The all appartment is very clean. You have your own keys and a code on the door.
We stayed there 3 nights and the only inconvenient was the neighboors upstairs (mother and teenager??), screaming at each other, but it last less than 15 minutes and then stopped.

Shops, pub and close to the bus/tube station.

A good place to stay in Greenwich!