Mark's house is located in a lovely residential area of DC, within close walking distance of the Metro and many restaurants and coffee shops. It's a beautiful space, and Mark has clearly put a lot of time and thought into making it a welcoming home. I had a seamless, nice stay that included a quick visit from their cute little cat! It was veryclean and matched all the pictures.
A couple of things that are helpful to know: you *have* to enter the space from the back, not just if you're driving. That confused me at first, though Mark was quick to help me figure it out when I arrived! The location also wildly confuses cab drivers - you might have to walk a little from where the GPS tells them you are for drop off or pickup. Finally, the apartment has all glass doors to the backyard - which is not private space just for this unit. There are curtains that make the space totally private, but when you have them open you might see other people / other people can see in.