Hi Drew,
Compared to other German areas, Munich is quite expensive. But the prices for food are comparable to the ones in the US in general. Eating out is a little bit more expensive, though.
Apartments have very different prices depending on the area in Munich. Be aware that an unfurnished apartment has really no furniture, sometimes even no kitchen, at least no fidge, etc.
For a short stay you would probably search for an apartment or a room e.g. sharing a flat with students.
Have a look at
Mr. Lodge - m?blierte Appartments, Wohnungen und H?user auf Zeit in M?nchen
ANGEBOTE
or if you want your own furnished apartment - very simple furnished but cheap for a short stay (about 25-45 Euro/night)
IDEAL SERVICED APPARTEMENTS - Ihre preiswerte M?nchen-Unterkunft
although the page is only in German.
Thanks