a VirtualTourist member
What is a recommended hotel near marienplatz with aircon and lift?
That would be Mercure Munich Altstadt. The other Mercure hotels aren't close to Marienplatz.
Clarence511: While most hotels do have aircon: Unless you travel in summer you won't need it. Besides, you should tell us a bit more: What's your budget? Do you like conservative/plush rooms or modern rooms better? "Recommended" says absolutely nothing when one doesn't like the style of the hotel.
I forgot: Should you like modern style better, you may want to see if Louis Hotel is within your budget: