Some dance schools will offer smaller studios for rent by the hour for serious dancers to practice, or even for couples or dance partners that just wish to brush up their skills. Often there is an additional charge for booking these studios but it may be greatly reduced if you are a current or past student of the school.
Don't be afraid to talk to current students of the school to find out what their opinions are. You may want to ask why they chose this school, would they recommend it , what is the best and worst feature of the school? Remember to ask several people to get a better overall perspective.