租房契約也是可以限制房客及其訪客的權利，
不是私權、居住權就無敵。
像下面這例子就是：
訪客進出要登記，
訪客要有有相片的身份證明，
也有限制訪客人數。
違約被中止契約的例子也是有聽說過的。
http://www.pc.pitt.edu/housing/policies.php
Visitors and guests
All visits are subject to the following conditions:
The roommate's approval is required, which is granted through the roommate contract. All resident students will have the opportunity to establish and regulate visitation through their roommate contract.
All residents and visitors/guests must present proper photo identification to gain building entry. Proper identification for visitors/guests includes state issued identification as well as photoidentification ca...