We thoroughly enjoyed our stay here!
Mari was very attentive and handled all of our very minor concerns very quickly. We loved being so close to so many of the things we wanted to see and do. The metro is an easy walk, as are grocery shops and restaurants. If you get a chance, try the German restaurant nearby (Cafe Berlin), it's delicious! We were a party of six ranging from 11 to adult, and while we definitely all fit, we did find things a bit cramped at mealtime and when the sofa bed was in bed mode. For the location though, we all considered it a minor inconvenience.
We would happily stay with Mari again if our travels bring us back to D.C.