This is a nice flat on a beautiful, old residential street in Chelsea. You can walk to Kings Road in 5 minutes and Sloane Square tube station in 10-15min. There are cafes, restaurants, and lots of shopping (mostly high-end boutiques) nearby. There is one (big) flight of stairs to the flat and no elevator. Check-in was smooth with a simple lockbox.
The flat itself is a good size with a large bedroom/main room and a small but efficient kitchen. But, the shower is tiny. I am 5'9" and my husband is 6'1". We both had to shower half-in, half-out as it was impossible to bend down or move around to do what you needed to do. No ledge to place any items inside the shower (low ledge outside). We chalked it up to a funny experience, but a hot shower sure would have been nice after a long day out.
The laundry facilities are shared with the building housekeeper, Mavis. We had to make an "appointment" for use of the machines and stick around the flat for 3 hours while the cycles finished. Not a huge deal as we planned to relax and have an early night, just something to be aware of. They had washing powder and the use of machines is free.
Highly recommend exploring the Chelsea neighborhood with a self-guided walking tour (internet search it).
Overall, this was a very nice one-week stay! Good-sized and affordable (for London) in a beautiful neighborhood.