The space is large and comfortable. Very homey. We noticed there wasn't a TV in the space, which was weird, but definitely not a problem for us. After all, we aren't there to watch TV! We had the iPad though and Marc supplied WiFi instructions, so we didn't have a problem being able to watch something when we wanted to wind down each night.
You do hear the foot noise and other noises (vacuuming we think?) from the space above. Marc mentioned he has children, and the little footsteps started about 6am each morning. The noise is to be expected when you're in a basement or lower level apartment though, so we were fine with it but I wanted to at least point that out in case you're expecting late nights for yourself and sleeping in the next day.
It was GREAT having a full kitchen with a stove and oven and dishes. That saved us the hassle of eating out every single meal. There wasn't a microwave or toaster, which wasn't a problem for us, but it would be even better to have those! Also, having a washer/dryer was PERFECT. I came up to do the Marine Corps Marathon, and after the race, we still had 4 days in DC, so it was nice not to have smelly running clothes lying around. That was a wonderful touch!
The bathroom was a little bit of a strange layout, with the claw-foot tub in the middle of the bathroom, and there was absolutely NO water pressure in the shower. That was irritating, b/c both of us felt like we never were fully clean (especially after having run a marathon--I felt like I couldn't wash like I normally would). I would definitely recommend a new shower head and maybe looking into how to make that better (the pressure was comparable to a dribble of a slightly kinked hose).
Marc was very candid about the distance to and from the Metro train station and bus stop so be prepared that there's a bit of a trek to get to public transportation. The neighborhood was beautiful and we felt very safe the whole time. He was so quick to respond to all messages, and even when we had an issue with a couple outlets going out (like a breaker or something), Marc had it fixed within minutes of my alerting him to it.
Overall, Marc was a great host and the apartment is great, if you don't mind walking a little farther to public transportation and restaurants. A few improvements to the place would be great but otherwise, I'd recommend this location.