Location, location, location! We wanted to be close to a main tube line stop (it's just steps from Notting Hill Gate station on the Central line) and Hyde Park (just a few steps the other way), and this place gives you that. I could walk with my young son into the Park, and the Diana memorial playground, every day. We walked across the park to the museums. We bussed and tubed around London easily from here.
It's on a side street, so it's quieter. And while, as a basement flat, it doesn't get a lot of sunlight, it means the bedrooms at the back are quiet for sleeping.
The place was clean, comfortable, and well-appointed with all the tings we needed for our 4-day stay.