Superb location within walking distance of major attractions like Hyde Park, where our kids loved the playgrounds and fountains, major museums including the Science Museum, and close to two subway/tube stations which made it easy to get around London.
There was a lot of space for the four of us (two parents and two kids) to spend time, eat some meals, and relax in between our activities. We had breakfast in the sunny nook each morning, which was especially nice.
Being on the first floor, the street outside can be a little noisy with cars, but the bedrooms are in the back and we couldn't hear any street noise when in them.