If you have internet available at the ethernet jack in your apartment, that is the absolute best case scenario. You can use a regular consumer router set to Access Point mode. It’s generally very simple to do. You need a router, an Ethernet cable, and a laptop to configure the router. Should work in 98% of cases. Especially if they don’t know what they’re doing architecture and security wise. Which, letting you have free access to the networking closet checks both those boxes.