Mark's apartment is a great place to stay when visiting Washington to see the sights. We stayed 5 nights and got great value from the apartment, not only from its convenient location (a brief walk to Georgetown and the White House locale) but also from its comfortable setup and amenities.
The apartment is clean, with a good sized bedroom with plenty of wardrobe space. Furniture is new and stylish. The kitchen is well set up for use and there is a good sized fridge, a little dishwasher (perfect for the small number of dishes our party of 3 generated), a stove top, microwave and coffee maker.
The bathroom has a lovely big shower and good sized cabinet.
My daughter used the sofa bed and found it to be comfortable. The queen sized bed in the bedroom was also comfortable. It was the middle of a very cold winter when we stayed, and the apartment was comfortably warm and there was plenty of bedding options so we didn't overheat at night.
The only downside is that any loud noise from the other apartments carries and you can hear the base from music in the bar a few doors up the road. This wasn't loud, just constant but I used earplugs and went to sleep easily (and I am a light sleeper).
Public transport options are convenient, we bused it mostly but when needed we used Uber and most trips were under $20.
We enjoyed our stay and hope to visit again in warmer weather so we can spend more time outdoors next time.