And after this tenant moves out, just remove it.I learned that when a tenant is viewing an apartment and they ask things like can we add more shelves in the walk-in closet, or darkening curtains because the street light is too bright, or put in hardwood flooring or paint a different color, etc., they will be high-maintenance tenants. 

Maintaining includes stopping leaks.Now, if it was a leak somewhere they could not see - like behind a water heater in a closet where they would not normally look to notice something - then I think they could argue they shouldn't be required to know what happens in a wall behind a water heater in a closet.But, a sink leaking and causing damage that can be seen - that was on them to "maintain" which would include letting you know about it so you could actually do the repair.As far as the shower grout - I think that's a murkier situation.  

I initially put a closet knob assembly in one hole (no locks, just a knob) and a 2-sided deadbolt on the top (key required to lock from either side).  

They won't feel comfortable trying to see how big the closets are or cupboard space.  

They're pretty easy to spot, because they never ask the normal questions like where is the nearest laundromat, parking, how big are the closets, etc.  

He moved out a few years ago but remains my craziest tenant story, followed closely by several others, like the peyote cult leader who grew peyote in his closet (which he claimed was legal because his peyote cult had official church status) and tried to stab his roommate one night during an argument at a backyard bonfire party.

She can also get some room dividers which are completely portable and stand alone to block off a section of the room.

Ozone (O3, made from O2) smells like a copy machine in a closet and will corrode (oxidate) any organic molecule by attaching the spare oxigen to it.

I actually had one stutter and then tell me (it was a young couple) that his aunt didn't want them on her couch anymore LOL.See if they ask about laundry or about parking or look at how big the closets are - if they don't, they're desperate and are just looking for anyone who will take them.Nolo Press has a good book about screening tenants, too. 

And you would be surprised at how they can mess up and admit they're sleeping on their aunt's couch, and they've worn out their welcome, etc.You'll hear the complaints, if they are high-maintenance types - "I don't know if this closet will work, can you put in more rods?"