This place is such a gem! We stayed here with our 5-year old for a week and it fit our needs perfectly. It's located around the corner from the Covent Garden tube stop on the Piccadilly line, which means you can get directly from Heathrow to here without changing trains. The neighborhood is packed with restaurants and shops and two grocery stores (Tesco and Marks and Spencer) within walking distance.
Best of all, Ann and Linda-Marie make everything seamless from booking to check-in to check-out. We arrived earlier than check-in and Linda-Marie was right there to let us in to leave our bags while we checked out the neighborhood. The apartment is more spacious than it appears in pictures and fully equipped with everything you would need to cook a gourmet dinner. They've thought of all the little details as well: there are maps and brochures of all major tourist attractions, guidebooks for London, a drawerful of umbrellas, and even a drying rack for the laundry. It's this attention to detail that really made our stay incredible. Thank you Ann and Linda-Marie!