Mark is a wonderful host, who ensures that any questions you have get answered quickly. He offers a warm welcome to the house (which is beautiful) and is a joy to get to know. I stayed in the downstairs garden apartment, which was spacious, well-maintained, and very comfortable, with all the amenities. The location is fabulous (a quiet street an easy walking distance from Dupont Circle), and there are tons of restaurants, bars, and service-providers in the neighborhood, including a fabulous Korean restaurant and a great brunch place literally around the corner. I was sad to leave after my month's stay was up, and I would, in a heartbeat, jump at the chance to stay here again.