Location, location, location. Lisa's place is perfect if you are visiting DC for sightseeing purposes. The property is very safe and is close to the metro bus stops, DC circulator and about a 10 min walk to the Foggy Bottom GWU station for rail access. We walked to the National mall area and back. It's totally doable but you may want to stick to the buses in case it gets too hot.
The apartment itself is well furnished, clean and has all the amenities one would expect. The Georgetown area is amazing. And if you get a chance, do try out the George's and Das restaurants right across the street from the house. Both of them are fantastic.
Christian/ Lisa are awesome hosts as well - Superfast in communication, personal touches of kindness and always ready to help. We loved our stay at their property and have no hesitations in recommending it to others.