I am from Xi'an. As far as I know, there are relatively few five-person rooms in star-rated hotels. I know that there is a hotel with four-person rooms, which is Xi'an Hongfang Hotel. You can check this hotel on Fengguang.com.

On Xiguanzheng Street, the price seems to be more than 200, and it is more convenient to get to the Bell Tower. You can negotiate with the hotel to see if five people can be accommodated in a quadruple room. If the hotel's requirements are not strict, it is usually OK. In addition, Xi'an

Some youth hostels have bunk beds, which can usually accommodate five people. There is an international youth hostel near the Xiangzi Temple Gate near the south gate.