We really liked the apartment. It was just as advertised. Lina met us at the entrance, and gave us a tour. The shower was good; lots of water pressure and hot water. The washer-dryer were very useful (note: the building has posted that they prefer you not use it after 10PM). The neighborhood was great; very close to the Notting Hill Gate station and the Kensington High Street stations, lots of great antique stores and restaurants nearby. It's a 10-minute walk from the Portobello market, a 10-minute walk from Kensington Palace and Hyde Park, and there is a bus stop for most lines heading east just 100 feet or so from the door.
The bed was very comfortable, the tea kettle was quick to boil, and Lina left us lots of tea. The wi-fi was fast and reliable.
We were there during the "coldest April on record" with low temps near 0 degrees C at night and even some snow. The apartment stayed warm enough, though. We didn't get an opportunity to test the air conditioning system.
The TV offered basic cable, with all the BBC channels (no SKY), but was adequate for our needs.
Great property for the price; will definitely stay here again on our next London visit!