Maria and Dan are the most welcoming and friendly hosts I've ever had the pleasure of renting from any time I've used Air Bnb. Anything we needed, any question we had, they took care of us (me and the other guests). Very responsive, and can definitely give you great advice on what's around if you're not familiar with the area and don't know what to try. Their basement apt is comfy, cozy and very clean! And they have done well to mark private areas very clearly to retain your privacy and theirs.
It's located in a beautiful and safe neighborhood, so again, a great place for those not familiar with DC. It's also not too far from Metro station and minutes from the nearest bus stop, so it's easy to use public transportation from there.
I don't think you'd regret choosing this as your place to stay.