The location of Guy's apartment is great - near a tube stop, within walking distance of Kensington Palace, and in a safe neighborhood which was more important to me as there were three of us (women). There are many restaurants within walking distance, as well as two grocery stores. Guy's place is very clean and lovely with a lot of windows and light (windows can be opened and shuttered which helped on days when it got a little warm in the afternoon). The kitchen is small and lacks a few things like washing cloths for the dishes, smaller spoons for eating with, and instructions on how to use the Nespresso machine, washing machine (there is no dryer), and stove (although we eventually figured out the washing machine and stove and just used the french press for coffee - he has at least two of those). The soaking tub is fantastic - very deep which is great after a day of walking! The shower head is a bit tricky to figure out as it is above the tub and there is now shower curtain but a drain on the floor (so don't leave anything near the tub that can't get wet if you are using the shower). The wifi was intermittent but we were able to get the information we needed and still post pics to social media of our adventures if we were near the wifi router.
There are 4 flights of stairs to climb before you reach the apartment, so that was a bit challenging for my 73 year old mother and for us to get our heavy suitcases up and down the stairs but we managed. There is no marking on the door for the flat number so that was a little confusing at first (as are the keys since they aren't numbered either for the front door and the apartment door).
Overall, this is a wonderful place to stay and in a lovely neighborhood within walking distance (at least for people who can walk a few miles) to museums and Harrod's department store. Beautiful and safe area and a nice place to call home for a few days.