Sam's place isn't in the prime area of DC however it was located well for the work trip we were making. It is however reasonably close to a couple Metro stations or you can simply catch a short uber ride into DC. Sam provided a clean and well furnished place to stay, the only negative might be the large island with bar stools with low backs as the only seating for dinner / laptop work which wasn't the most comfortable, there is no table and standard chairs. There was however a couple comfortable couches to relax in otherwise. Like many older homes the upstairs stayed plenty warm while the downstairs struggled to keep up, we simply turned the heat down at night to keep it comfortable while sleeping. The immediate neighborhood (walking distance) has very little to offer however a short drive provides access to National Harbor or plenty of other dinner or shopping areas.
We would recommend and stay again if we are in this area again for work.