Just finished up a weeklong stay at Charlotte's place, which is actually managed by a very responsive agency. The location is fantastic, just a few minutes' walk to the Marylebone station on the Bakerloo line and about a half-mile from Regent's Park, which is perfect if you like to start your day with a run as we do. The place was definitely "cozy" and a bit smaller than we had pictured but it was extremely clean and had all the amenities we needed, including a small washing machine which came in handy. The management staff was very responsive, including handling a late-night check in on Christmas night by offering to have a representative meet us (ended up not being necessary as we used the lockbox but it was nice to have that offer). This was just enough space for our family of four for one week but not a lot of room to hang out and relax...not a big deal for us as we spent most of our holiday running around London but not suitable for more than a couple and two kids. All in all we had a really great time and appreciated the hospitality, cleanliness, responsiveness and location!