I'm looking to rent a room in a house... should I get a twin bed or full bed? I imagine i'd like to discourage two people moving in for the price of one, so would i get a twin bed?
Do you expect a kid in elementary school to rent the twin bed? I would at least get a double. Who cares if they have more than 1 person there, is this a room in your own home? Just make a rule that extended overnight guests are not allowed and they will be charged for it and you will end their month-to-month lease. I would expect any normal single person to have a date overnights now and again anyway. It isn't fair to try to limit who they can have stay over if they are renting a room.
Get a twin XL, it’s just longer but same width, and it leaves you a lot of space. Heck eve get a twin Xl loft bed with a ladder and you will have the whole floor with more space to an office haha.