We've had a great time in Tass's flat. Our family of 4 persons (2 adults + 2 teenagers)spent 8 days and nights there during April 2015. Actually, I can’t think of any cons relating to it. The flat is located at the second floor of a very nice building with an intercom, in a very quiet street in the lovely neighborhood of Notting Hill. The famous book shop from the movie is just around the corner and the Portobello road market is about 2 minutes walking. There are a lot of restaurants, pubs and coffee shops nearby. The tube station (Notting Hill Gate) is not in a walking distance, but you can catch a bus just around the corner that comes very frequently (one of the lines is a 24/7 one) and will take you there in no time. The bus lines also get to a lot of sights of interest like Oxford street and the natural history museum.
The flat itself is spacious and was very comfortable, quiet and clean. The beds and the rooms were big enough for us and the mattresses were also good. It is also equipped with a washing machine, dishwasher and an oven. There is hot water in the taps all day long and the water stream is strong. Except of the bedrooms and the living room there is also a service room where you can hang the towels or the laundry to dry.
The communication with Tass was great. The questions we asked were answered very quickly and kindly. As we arrived from the airport, Lilli, the cleaner, showed us the flat and explained all that we needed to know.
If you consider staying in an apartment when going to explore London, we are sure you will have a great time there.