I can't say enough good things about our stay. As often happens our flight arrived early in the am. and check-in is at 3:00 pm. We knew the departing tenants were leaving the day we arrived so getting in the apt. early wasn't possible but we were able to leave our bags with the porter so we could begin exploring the neighborhood. After coffee at nearby Starbuck's, browsing at The Conran Shop and lunch at one of the restaurants at The Kensington Tube stop the apt. was ready early. Being able to stay in constant communication with Stephanie made it all run smoothely.
The apt. is roomy, comfortable, clean and quiet. There are plenty of supplies like soap, shampoo, toilet paper and a Sainsbury grocery store a few blocks away. Having two bedrooms and two full bathrooms makes it a good choice for two couples or three people to share.
The location couldn't be better. It is a short walk to the South Kensington Tube stop that gives you access to three Underground lines giving you the ability to get anywhere in London in minutes. One of the lines, the Piccadilly goes directly to Heathrow making it unnecessary to pay for a taxi. We bought an "Oyster Card" at Heathrow to pay for all Tube rides and were able get a refund on unused balance before leaving. We used Uber to return to the airport for an early flight, our only experience with Uber in London but that worked perfectly too.
I believe South Kensington is more residential and less touristy then some areas so you don't have to compete with tourists in shops and restaurants. We really enjoyed the pedestrian restaurant area behind the So. Kensington tube stop and liked being within walking distance of Harrod's, The Victoria and Albert Museum, Sloane Street and Sloane Square.
I can't think of any changes we would have made to our visit other than stay longer.