Cast iron and tile pipes from 1970's and earlier certainly would be a big question mark for pressure testing.  

We put granite on all counters, porcelain tiles downstairs, walnut flooring upstairs, and we included 3 beautiful handmade black walnut barn-doors as well. 

We ended up replacing a lore more drywall than originally expected, laying all new floors, gutting bathroom, all new interior and exterior doors, all new floor and door trim, "new" applicances, new lower cabinets and counter tops, and of course new paint throughout.

Spent $1k on bathroom to include new tub, tile to ceiling in tub area, new vanity, medicine cabinet, drywall, lighting.

We use vinyl plank and carpet tiles mainly as flooring where we can replace part of something instead of the entire floor for example.

New roof, hvac, carpet, paint, tile, appliances, etc..It still needs some cosmetic work to the exterior but with its monthly revenue, we could afford to put money into it pretty easily if we needed to after this current tenant vacates.

There were furnaces without filters, sink bases that the bottomso had disintegrated from water damage, and ceiling tiles completely brown and falling apart from water.

If I was a gambler I would lay $1000 this is a scam.

And I've been researching around on the internet it looks like "wood like tile" seems very durable solution. but my contractor told me it's very pricy - 3 times more for material, 2.5 more for installation. 

It has tile flooring throughout, central a/c, laundry closet, accordion shutters.