They can give you an idea of what things you should pack, (family pictures, unique art, etc), and whether you can rearrange your furniture for the most welcoming presence or hire them to bring in staging furniture. 

My markets they all come furnished because they were STRs previously so the seller never wants the furniture.

Not because all under 25 cannot be trusted, but they do not have the experience with:a - managing a house (garbage, heating, recycles, not jumping on furniture, turning off stoves, fireplaces, being safe in ocean, lakes or around the pool)b - managing their friends (think of the peer pressure - they have a house all to themselves, likely for the first time - they WILL invite people they meet over)c - cleanliness (who picked up after themselves at that age?) 

IKEA furniture is another story though, I also bought a couple of dressers and a bed frame and headboard, etc and that was barely above junk in my opinion!

One question I have is how to incorporate depreciation of fixtures (kitchen, bath, floor) and furniture (including curtains, etc).

No kids, less spending on clothing, electronics, and furniture.

Furniture, clothing and a lot of personal effects.He claims that he has 30 days to get everything out and that we are obligated to store it for him.

Staging can be very important especially in a home that big so it may be worth renting some furniture.

Maintenance, Repairs, Or Alterations: Lessee shall maintain the premises in a clean and sanitary manner including all equipment, appliances, furniture and furnishings therein, and shall surrender the same at termination thereof, in as good condition as received, normal wear and tear excepted.

Then I did furniture stripping and refinishing for years.