My family and I (children 8 and 11) spent 5 nights in this very cozy flat in a central location in London between Soho and Covent Garden, close to restaurants, theaters and shops. The flat itself was very charming and had a nice view of the roof tops. The single glazing, however, which is typical for London buildings (having lived in London ourselves for several years), did make the flat a bit noisy at night, but it was expected for a flat in this location and it wasn't too bad.
Jan, the owner of the flat, made sure everything was taken care of prior to our visit and as he was not able to welcome us himself when we arrived, his good friend showed us around and provided all the practical info we needed for our stay. It was all good.
We can definitely recommend the flat to others, including families with children.