There are almost no houses for 30k anywhere in the metro area, except burned out or gutted houses.

As far as I can tell (I've personally seen the outside/picture only for the inside) and its not a gut job...its a remove wall paper, paint walls,remove carpet on stairs/lightly sand and refinish floors job with a large lot that would look if 2 nasty trees are removed and includes an elegantly shaped and I believe well maintained pool,  The front steps need pointing but are solid and if I pressure the concrete (all solid) it will look much better. 

Doing a cosmetic fixer would be good, but unless you have the knowledge and money to do a gut job don't do that.

My gut is they might try small claims against you, which you do not need an attorney but you need to prove you paid the contractor and any written discussions.

My instincts are the opposite - I am irritated by this gradually deteriorating lapse in communication and effort.

To complicate matter the sellers per the contract are supposed to finish remodeling one of the units, which is currently pretty gutted.

If you don't want to gut and totally rewire I suggest at least adding some grounded outlets by the windows for window air conditioners assuming no forced air.

Depending on how you want it to look you may want to do all the gutting, rough in, cement board, ect yourself and leave the final tile work to a pro. 

In my market total gut jobs are going to be $50 per foot, but a light cosmetic project can be $15 per foot.

The current owners have gutted each unit and already rehabbed 3 of the units.