We stayed 4 nights at Helen's flat. The experience exceeded our expectations! We arrived late the first night and Helen kindly met us at the flat to provide us with usefull information and to answer any questions we might have had. We were happily surprised to find that Helen had left coffee, bread, jam and milk for us! Additionally, Helen was very flexible concerning our time of arrival and departure.
The flat is, as described on the website, centrally located (10-15 min walk from main attractions i.e. the Royal Mile, Holyrood House and Arthurs Seat etc.) and the neighborhood is safe and quite during the night. We highly recommend staying at Helen's during your visit in Edinburgh!