A beautiful and homely place, and a great location. Logan Circle has some fantastic cafes (try Slipstream for wonderful coffee) and great bars (ChurchKey for huge choice of craft beer).
A very peaceful base and lovely neighbourhood, yet convenient for getting into town (we were at a conference, and it worked well) - definitely recommend it if you are visiting DC for business or pleasure.
Just note that whoever gets the main bedroom gets a better deal than the second room with the foldout bed. It was comfy enough, but maybe not for a long stay.