In this world, mutant animals and humans exist on earth, along with regular people. The MC can instantly teleport anywhere on earth freely (his super-power) no matter the distance, and can teleport objects he can touch up to the size of a small house.
The technology for mutant society ranges from primitive (bows and carriages) to modern tech we see today (guns, internet, cars, etc), but the normal humans have noticably superior tech like spaceships that can travel to other planets in the solar system, radar that auto detects DNA when something passes through it, machine soldiers sometimes almost indistinguishable from humans, manless self-operating factories that can mass produce stuff like food clothing and vehicles very quickly, supersonic bullet trains, etc.
The resources MC has access to personally: TV, PC, basic furniture, heat & air conditioning, alarm system, cloth-like body armor that defends against small-arms fire and blunt force (like falling off a building), a cell phone, a utility belt with a variety of situational items, a powerful AI inside his sanctuary very similar to a person (which he can talk to through a device on his armor).
He doesn't want others to access or know about his sanctuary, both humans and mutants. What is a feasible place for him to live?
The mutants have various abilities including but not limited to: flight, super speed & strength, project lightning & fire and other elements, telekinesis, etc.
It's a post-apocalypse, mutants live in areas outside civilization, like forests or abandoned cities, while humans band together in fortified areas.