There are many places for self-study in Xiamen University. You can study in the Nanqiang No.2 teaching building next to the library, and you can go in and out at will. I don't know when the landlord went to Xiamen University. If it is at school, it is difficult to find a classroom that does not have classes all day. If you can find the legendary postgraduate entrance examination classroom, you will be very lucky. Go along the avenue, there are study classrooms in Jiageng IV and Jiageng V, and then go ahead, there are classrooms in Jimei Building.
Good luck.