First, responsiveness. Laura was one of the most responsive hosts. Anytime I had an issue or question, she quickly handled it.
Second, location. I was in town working for the summer and loved the metro access. Her rental is right across from the Stadium-Armory metro stop. And given that it has three lines (Blue, Orange, and Silver), I never had to wait longer than 5-7 minutes.
Third, quaint. The rental, while small--like everything affordable in DC--Laura very effectively used the space. I felt quite comfortable and relaxed. By the end of my months-long stay, I felt sad to leave, which is not true of every rental.