My husband and I stayed at Mary's place this Labor Day weekend. This was my first time in DC so I wasn't familiar with the location of the house to all of the attractions in the city but luckily using Uber share and lyft share, rides were between 3-6 dollars. The home was also a quick ride to the airport which was great. Mary was great with communication and the room and bathroom was clean. My husband and I would leave in the morning and stay out until we came back to shower and go to bed. Some things I would let other guests know:
1) the area along H street and up and down the blocks look "up and coming" at night, it gets interesting and if you are not cultured to certain sceneries this may not be a perfect setting.
2) I wish the rooms had locks on them. I stayed at an Airbnb room in Minnesota where the host had keypad locks on every room that was rented. I would suggest something like this for the house because at first, I was a little apprehensive about leaving my stuff out in the room knowing if other guests were there they could enter my room and no one would know.
Overall, my husband and I enjoyed our time in DC and the house was a perfect place to crash at the end of really long walking days.