I will be traveling to Prague toward the end of June. Is it important to book a room at a hotel that has air conditioning?
Do you need air conditioning in Seattle? On the warm and hot days? Same answer.
It is rarely that hot in Prague. But if it is you would be glad having it. Also lately they built a lot of new apartments and hotel rooms in the attic spaces. You definitely need air-conditioning there in summer, believe me, I know.
I was there in June once and it was warm one day and cold and rainy the next. To me, a/c wouldn't be an issue but I am not an a/c person.