Mal is an amazing host! he responds so quickly and always ready to help. We had a last minute cancelation from our previous host (literally) and Mal was able to prepare the flat within a few hours notice.
The apartment is very nice, spacious, clean, looks like new, has everything you need, located in a very quite and nice neighborhood, close to a supermarket, restaurants, shopping mall, two metro stations, 5 min drive from Notting Hill area. You can also park on the street for free after 5 PM until 9 AM next day (plenty of space).
We were a family of 5 (3 kids) and stay for 6 days. We only had a problem the first night as one of the beds didn´t have a suitable mattress; we contacted Mal and the day after he brought us an extra mattress, so problem solved. Just be aware of the stairs, in case you are carrying too much luggage (like us) or have some mobility issues. The other actual issue could be the distance to the city center, as it is about 10 km away from Westminster area. So taking the tube could be the most recommendable option; we decided to drive everyday into town as we had the car with us.
Overall, we had a great time at this apartment and the host is always ready to help (which after having 3 previous cancelations to go to London from our hosts, we particularly value). Highly recommendable.