Fantastic location, tons of space, and outstanding service.
This was a terrific find for us. We were a family of 4 and the apartment at The Leonard offered the space we needed, in an excellent location.
The master bedroom is very generous in size, w/ a great desk if you have to work at all. The master bathroom has a soaking tub which is a rare find and a treat after a long day of walking London. The second bedroom can be configured as a King or two twins, very helpful if you have kids. There's terrific closet space, a huge livingroom and plenty of space in the kitchen to cook if you want to have meals at the apartment.
The location is fantastic - just a block and a half from Marble Arch Underground/Hyde Park/Oxford Street shopping, easy walking distance for many of the touristy neighborhoods, etc...
The building and apartment feel a bit like stepping back into time. If you crave modern lines and furnishings this won't be the place for you, but if you enjoy period design and uniqueness you'll find it charming. The height of the ceilings, moldings, design, etc. are of another era. Some of the furnishings (especially appliances) feel pretty dated in a less charming way, but everything works just fine. The floors are crooked and creaky, but the space is remarkably soundproofed. (There were roadworks happening in front of the hotel when we stayed there but we didn't hear a peep in the bedrooms. It was a really pleasant surprise to find how quiet the space was, especially at night.)
We booked this on AirBNB, and were surprised to find it was managed by a hotel. That actually ended up being a great thing as we had the benefit of daily housekeeping service, the ability to leave luggage before/after check-in, and a staff always on duty.
The thing that most stands out about this rental though, was the outstanding service. Every email or message I sent during booking or leading up to our stay was answered promptly, often within minutes. Every question was met with a helpful response, and every request (bed configuration, early arrival, onsite needs...) was accommodated. The staff onsite were as warm and helpful as those I dealt with online. It was the kind of service one expects from a Ritz-Carlton or Four Seasons, not from an airbnb booking, and it more than made up for any quirks of older space. I would stay there again in a heartbeat, especially with a family.