Really can't say enough about Mercy's place.
Pros
This place was spotlessly clean and well stocked for any type of traveler. She even left us bagels and stocked the fridge with breakfast foods (bacon, eggs, milk, oj). The appt was decorated with style and I enjoyed the selection of books and military memorabilia that was in the appt. The beds were comfortable and I really did feel at home. Free parking and pet friendly in a city that charges an arm and leg for both. The location is convenient depending on where you are going in DC. The bus stop is about a 2 minute walk from the appt and it's an 8 minute ride to Takoma Station (Red Line). For our trip, all of our destinations were near metro stations so this method worked great for us. It was nice to leave the car parked and not have to worry about parking. The neighborhood is residential, diverse, and felt very safe. We had no problem returning at night with our 4 year old and everyone we spoke with was friendly. We had one small issue (that was our fault) and it was handled quickly and professionally by Mercy and her son Percy. I really can't say enough about the host or her place. They made our stay very special and memorable, my son loved the appt and didn't want to leave.
Cons
Not many. The parking area can be a little tricky to navigate, but it's a city neighborhood so that's to be expected. The neighborhood is all residential so if you are looking for shops/restaurants you will have to head to some of the other neighborhoods.