The average price of a room in a hotel and apartments in the historical center of Krakow is 60-80 euros per day for double occupancy. Hotels and apartments further from the center are cheaper. You have find many budget hotels in the Jewish district of Kazimierz (40-50 euros).
The most expensive housing - in historic hotels in the Old Town.
Parking spaces in the old town too small. All of them are paid (about 10 euros / day). Alternatively, you can choose a guest house on the outskirts (for example, Metropolo by Golden Tulip Krakow) and drive to the center. Parking a car will cost 1 Euro per hour.