Model tenant is moving her fiancé into her apartment for one mont

[Dennis Ulrich]

I have a model female tenant at my property. She is respectful and has never caused any problems. Her lease says very clearly that guests are only allowed to stay on the property overnight with advance written permission from the landlord (me). So I was surprised when she notified me that her fiancé will be moving into her apartment and staying with her for one month, beginning tomorrow. The fiancé is recovering from surgery, so I would like to be supportive. However, seeking advance written permission is not the same thing as "Hey, by the way someone is moving in tomorrow". That is not "asking". If I just allow it, the other tenants in the building will take notice, as this is highly unusual. On the other hand, I can't say no without appearing callous, given the circumstances. There's also the fact that this tenant has been stellar in every other way so far. What would you do? One possibility is that I could raise the rent for that month.