I work with investors that have 500+ properties, they do not want to worry about stained linens or responding to a message at 11 pm at night when someone is too drunk to enter the door code correctly ☺️.

If you have hardwoods where your staining them, paint first then refinish them.Good Luck.

Along the way, be prepared for hundreds of leaky faucets, stained carpets, broken tiles, and bad tenants/agents/contractors.

Agreeable grey walls, repaint the cabinets white if they’re stained.

They stained the stucco on the exterior kitchen wall when they cleaned out the sliding window track of the frame with the water sprayer from the kitchen sink. 

The stains had gone into the subfloor, so we had to seal it with shellac before installing new flooring.

When I looked at it closely, there is water stains in this area and the termite employees also noticed it.

There still is a light haze on a lot of the tile.The label of the Miracle Sealants product says it contains hydrochloric acid.Another product, Aqua Mix Cement Grout Haze Remover by Custom Products, contains phosphoric acid, as does Deterdek Cementitious Grout Haze Remover by Fila.Another option is Aqua Mix Sulfamic Acid Crystals by Custom Products.I also have seen recommendations for using acetone to remove grout haze.I want to get this right with one more cleaning, and I don't want to stain or damage the grout in the joints.

If Tenant B moves out a year later, they can't blame Tenant A for the broken window or stains in the carpet.Good on you for confirming Tenant B can afford the rent on his own.

This leads me down a rabbit hole:This is likely a very old house.It likely has some deflection in the floors (so you are never going to fill gaps and have the filler stay)Wood joints aren't true any longer due to shrinking of a 100+ year old materialYou have a number of different patches if looking across all of the pictuers.So, the last thing I would do is refinish this floor with a natural/stain finish.If it was a section 8 grade rental or similar, I would do a sand, vacuum, and paint with a flooring paint a brown.