Throw some carpet down?

I would also charge for cats because in reality cats destroy more than dogs if there is carpet in the property.

New tile flooring, carpet, baseboards, granite, paint, bathrooms, doors What was the outcome?

Otherwise you will have an experience like I did where they were using my rent money to buy carpets and blinds etc for other people and for their own properties. 

Our rehab includes new appliances (basic, not over the top), all new flooring (vinyl plank throughout except carpet in the bedrooms), new plumbing and electrical fixtures (including ceiling fans), cabinet repair and painting, sheetrock repairs, new shower/tub plumbing and tile surround, bathroom vanity top and sink, new toilets, paint, and backsplash. 

Yes i have done my calculations and I buy properties that are in decent shape (I look for properties that need windows, flooring, carpet, and paint).

15 years ago I had a PDF that outlined paint colors, carpet brand, cabinet brand, flixture brands, etc.

How much will it cost to paint and carpet a bedroom in your area?

Replace worn carpet with laminate, etc.

A new tenant coming in looks at a space with a FRESH set of eyes whereas the existing tenant usually gets used to seeing old carpet, scuffed up walls with paint, etc.