Your apartment should look clean, take a good look at the stove, refrigerator, sinks, tubs, stool. The carpet should be clean, all the garbage out, any holes in the wall repaired including nail hole, doorknob bangs, furniture banging against wall etc. Leave nothing behind that does not belong in the apartment, do not take anything that belongs to the apartment (for example curtain rods or blinds, toilet seats, or smoke alarms.
I like the idea of someone from the office taking a walk through for you if they would agree to do that. Some buildings owned by large companies have a check sheet you can go by. Some landlords like to keep deposits if they can come up with any reason at all, others are more reasonable and are just grateful if you remove your stuff, garbage and don't damage the apartment. You might check with people that have lived there for a time and have talked to and seen people moving out.
Get a signed copy of the walk through. Good luck.
Landlord for 15 years.