We arrived at Han Tang Inn (the sister hostel of Hantang house) late in the night after 2am. Even if we booked before for Hantang house they moved us here. When we arrived in front of the building didn't know what to believe but because it was late there was no point to be suspicious and afraid of the accommodation (in China it can be tricky sometimes). So we step in, took the key and went to sleep. The room was amazingly good.. big and warm with 2 single beds bigger than the normal size, a desk and a tv. Inside this hostel it's like a small paradise with many courtyards (first floor and roof top) and sauna. Every morning we had breakfast in the hostel before going out. The breakfast is also cheap and consistent so you can have energy to explore the beauty of Xi'an. The stuff are nice, friendly and useful, giving us a good advice every time we asked. And even if you usually expect younger people in a hostel here you could find all the ages.
Also it's close to the Drum Tower (5min walking) so really convenient while visiting and when you don't have too much time to lose.