The city is perfect. You can do a day tour to several historical places and at night you can apreciate good jazz while drinking in several places. Besides that people there are extremelly friendly and the food is awesome,
Insider Tip:I do not indicate taking those paied tours, they do not worth the price. Instead of that you can do a walking guided tour where you can pay less, actually whatever you want to the guide or what you think the tour worth. It is cheaper and you can enjoy more the tours. The touristic stuff are not very far from each other and anyway you can use the public transportation for going anywhere you want, that is faster, at least than the sighseen bus.