The apartment is cozy and well-appointed--it's recently renovated (we were the second guests in it) with brand new (very nice) appliances and lots of closet spaces downstairs. The spiral staircase took a bit of getting used to, but we got the hang of it. There's a washer-dryer combo (these take a while, so don't expect quick loads before bed) and USB ports a-plenty, so no need for converter plugs (unless you plan to bring some other electric gadget with you). There is a French press for coffee and a nice hair dryer, too, which was very nice to have.
When we noticed there were no kitchen cooking utensils (try flipping eggs with a fork), and the dishwasher didn't power up, Charles came over with a bag full of new stuff (spatulas, colanders, graters, tongs, etc.) and his handyman to repair the dishwasher circuit breaker and loose showerhead--both were very nice and apologetic, and everything was ship-shape once they left. These were clearly punch list-type items, as only one person had stayed in the apartment for one night before us after the renovation.
All in all, our stay was delightful--the apartment is two blocks from Portobello Road and all its restaurants and pubs, three blocks from the Westbourne Park Metro Station feeding to the Circle Line into town, and a few blocks north of Hyde Park. We traveled all over London easily by subway and on foot, and then took the Circle Line to St. Pancras to board the Eurostar to Paris. We'd do it all again in a heartbeat.