My cousin and I had a lovely stay at Chris's place in Marylebone. I already miss the apartment!
Pros:
Flexible check-in, safe (and absolutely beautiful) neighborhood just a minute away from town, clean and cute apartment, communicative host, and safe building.
Cons:
Honestly none. There was a minor leak in the bathroom (but it went unnoticed by us), and the water shut off temporarily for a few hours, but Chris was really helpful in getting all of this sorted out.
Highly recommend renting this Airbnb! Could not have enjoyed my stay more.