Great location, a block from Marylebone station. The bathroom was huge with heated floors. Tesco Express is a block away and has most of what you'd need (milk, sandwiches, snacks, laundry detergent, etc) the apartment is a tight fit for 4, but it's manageable. Sian was very accommodating and easy to communicate with during the booking process. We had an early flight into London and Sian was very flexible with check in, which was a huge help. The apartment was clean, fully stocked with all the needed amenities. Bedroom is in back of apartment so quiet, front room heard only street noise which was minimal.
We had a great stay and would recommend!