I could not find the price of Huangshan Hot Spring and the time it opens and closes.

It is open from 11:00 to 23:00. It costs CNY 398. The hot spring is inside the mountain area. You can take a bus to it from Xinguoxian Bus Station for CNY 11. By the way, you needn't pay the admission fee of the mountain if you just want to bathes in the hot spring. The hot spring is highly recommended to you. It is very comfortable and delightful.

Yes, you can go to the hot springs in the down town area. For instance, you can go to the one on Huashan Road, Tunguang Town, Tunxi District. ;)