"Touring DC" can mean a lot of different things to people. Due to traffic I would recommend staying in "Old Town" Alexandria (lots of tourists), can take free shuttle (runs up and down King Street) but to Metro in Alexandria that will bring you into DC. Also lots of restaurants, bars, ghost tours, water taxi's to DC, Mt. Vernon, and National Harbor, you will want to be walking distance from King Street. Lots of hotel choices from Boutique to Major Chains. You could actually park your car and do public transportation for many things. You could also stay at National Harbor, more expensive, car for all transportation pretty much, IMO better to visit for a day than to use as home base for DC Touring.