The production efficiency is much greater than traditional home building due to the ability to manufacture rooms/homes indoor, mass replication of standard designs, high durability of materials (so I’ve heard), and the ability to drop it on a slab without the need to dig out a foundation.

Update the flooring by pulling out the carpet and laying down a durable engineered flooring and paint all the interior walls. 

I do like the durable construction methods in Spain a d the low operating costs.

However what are some other tips & tricks you have tried that help with durability, reduced maintenance, & appearance of your units?

I would get 2 or 3 quotes for repair or replacement of the carpet, charge the tenant the amount of the lowest bid, then replace the carpet with a more durable flooring.

It's not flashy or high tech, but it is cheap; easy to maintain or replace; and durable.

I do everything everyone else say, but I also make sure to use really durable materials (particularly flooring) when I rehab my units.

It seems to be quite durable.

I'm open to anything and am willing to pay more now, within reason, for more durability and less maintenance long-term.Suggestions?

@Julie Marquez Seems like your issues lie between the happy medium of cost, decor and durability.