We rehab with the view of keeping our ongoing maintenance costs as low as possible which means trying to make the places as indestructible as is feasible.
Nothing is indestructible but, replacing all floors in a unit with tile, minimizes the damages caused to carpet, wood floors, etc..
The tenant wants rugs, they can furnish and take them with them. Remember to keep the grout dark, grey or darker, as that minimizes the dirty look of light grout needing cleaning and re-sealing.
Replace fluorescent lighting with cheap easy access standard bulb fixtures. We use the same fixtures in all units, again for stocking and replacement. Nice fixtures,but cheap, and try and find fixture covers that will not break when the tenant drops it while replacing a bulb.
No horizontal blinds but rather vertical blinds where we must provide window treatments, and always the same manufacturer so that we can maintain a stock of replacement parts.
All rooms, all units, painted the same, and clauses forbidding repainting of any type, as well as no smoking whatsoever, all the same paint, color and manufacturer. We use home depot UltraHide antique white. Available in 5 gal buckets and we always have some in stock.
Bathrooms, floor to ceiling tile, no soap dished in the bath, tenants sometimes use them to get out of the tub, or stand on them to shave their legs, and pull them out enough for water to get behind them.
No bathroom window in the shower, it is a leak waiting to happen.
The end result for us, is that when a tenant moves out, it is a quick clean of the tile floors, fix the holes in the walls, touch up the paint job, re-caulk where needed and the units look wonderful, immaculate, and rent easily.
For tiles, whenever possible, we buy closeouts, from Home Depot or Lowes, watch your lot numbers, and store them in our storage garage. You can often find nice travertine tile at less the .70 a square foot. Buy the mortar and grout as and when needed, do not store, do not listen to the HD or Lowes sales person when he offers to pick them out to go with your tile order.
Learn how to do the tile work yourself, my husband has done the floors in all of our units, he now hires temp help as his back is not what it once was, but he knows how do the layout, can oversee the workers doing the laying. A throw-away tile cutter is $80.00 at Home Depot. They sometimes last three or four units!
The cost winds up comparable, a bit more expensive, to having someone lay new carpet, and tile will last three or four times carpet and the cleanup costs for carpet or two or three times those of tile.
Cheers, the basic message, rehab for lower maintenance costs.