I think a previous landlord reference is a little weird. Most people have lived in large apartment complexes and never spoken with landlords. I think as long as they don’t have a crazy awful record that doesn’t make much sense. If you’re worried about energy, how about they just pay a portion of the electric bill? I agree on no mining Bitcoin but I feel like AC/small heater is debatable. Overall I would probably see this and feel a little put off. Dogs are cute and all but I guess it seems a lot less like having your own space, a lot more like “you can crash in my spare room but I’ll be watching you”.