Hi, it is hard to respond without additional information, but 3-5 days should give you a good feel for the city.
It really depends on what your interests are. If you just want to see the city and some of the more popular places to visit, figure around 5 days. You could certainly be kept very busy for a full week as well. Anything less than 3 days is not very good.
3 days, two nights.
Regarding accomodation, look into Herbst Haus or Gryphon House. Both in much better locations to see city than Nolan.
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