Munchen! Absolutely love your city: my wife and I were there last December for Xmas Market in the Marien Platz but I've been ten or more times since the '80's. (I've had a relationship with a German manufacturer in Freiburg for several decades and have also sold all over Germany with 50 or more trips total.) I've probably driven almost every km of autobahn while also returning several times to the Kaiserstuhl (I'm drink wine), Baiersbronn and Garmische/Partenkirchen. I must tell you: from thirty or more years of doing business in Germany (I am retired now.) my last trip to Europe will be to Munich and the Bavarian Alps once more.
I also have too many opinions: when you return to the U. S. and D. C. please consider staying on Pennsylvania avenue (i.e. the Willard or the Marriott). They are expensive but are on one of the Great avenues of the world. The entire Mall from the Capitol to the Lincoln Memorial is extraordinarily beautiful-about a 3km walk in each direction. The Georgetown waterfront is very nice with an excellent restaurant, Fiola Mare, which is generally similar to Munich's Tantris in quality and expense. DC has a great deal of character and feels very European. Part of it looks very much like Munich. As Munich has so much that is beautiful and interesting within 2 or so hours, so does D. C.: Old Town Alexandria, Virginia wine country (in Fauquier and Loudoun county which are similar to Baiersbronn in countryside), Annapolis, the Eastern shore of Maryland including St. Michael's and Chestertown, Williamsburg and north to Philadelphai (Lancaster and New Hope).
Munich has a great subway. D. C.'s is good but not as extensive as Munich's. You'll probably arrive at Dulles airport and it is about 50-55 km downtown where the subway is extensive. (But unlike Munich, it has not opened to the airport yet.) Garage parking can be expensive, US $25-35 a day.
Have a great trip and enjoy the D. C. area! I will toast you with a Spatburgunder tomorrow night...