The Carriage House location is ideal if visiting down town or anywhere else in the DC area - we went as far afield as Old Town Alexandria and Tyson's corner.
Having Safeway literally on your door step is a blessing, and we made good use of it.
David had warned us that there was construction going on, in the area, but it didn't interfere with our sleeping late, or comings and goings.
We arrived mid-afternoon and David was waiting for us. He walked us through the house showing us everything we needed to know. Our fridge was stocked with some essentials which was very kind of Susan and David.
David checked in with us from time-to-time, to make sure everything was going as expected.
We had a very busy period and therefore were out for most meals, but we did cook the odd breakfast. Everything that was needed was available.
There are 2 metros in walking distance, both of which we used. Ubers struggled to find the alley and rear entrance, so we would meet them on E street in front of the house. Getting dropped at the Carriage House door was no problem.
I think this is a wonderful place to stay. My only cautionary note is to be aware of the steps. One must be able to negotiate an external stairway, and an internal spiral stairway. We kept our luggage in the lounge area, as it was far easier to do so.
Susan and David are nice people and great hosts. I highly recommend Susan & David's place when visiting DC.