The wood look porcelain is very cool and popular.

Porcelain and stainless steel tiles.

We are rehabbing a house for ourselves to move into.I have a question on tub material. how good is a porcelain on steel tub as opposed to a cast iron tub?

This is a ceramic tile, not porcelain. 

I can build an addition for about 120k that contains two "units" of 2bd/2.5ba each with lots of premium features (9.5' ceilings, acid-stained colorful concrete floors, radiant heating throughout, central air, LED lights, granite countertops, subway tile backsplash, carrara marble porcelain look-alike bathrooms, etc.)

In most houses we encounter, freeze damage in drain lines is ALMOST always confined to toilets (look for fine or major cracks in the porcelain) or traps.  

I was told at the tile shop that through-body porcelain is the only kind of tile that's virtually impossible for tenants to ruin.

Under the kitchen sink and lav sink.Check all the blinds.Wash window draperies.Pest control the inside and outside.Touch up painting.Check all hoses replace hoses if necessary, turn on and off all stop valves, replace with new quarter turn if necessary.Garbage disposer gets a thorough clean - ice, vinegar, hot water, bleach.replace AC filter.WD40 every door hinge.Recaulk exterior door jamb if necessary.New light bulbs where needed.New backup battery for smoke alarm.No carpet cleaning, all my properties are tiled porcelain or natural stone.Inventory of hurricane panels and hardware.I keep an inventory of drawer pulls that is needed for each property and buy enough when there is a clearance sale.

I installed the bathroom with some porcelain and it looks really cool, but as I won't live here long enough I think I am just going to install the rubber commercial stuff.

Originally posted by @Ryan Collins:Hello All, @Ryan Collins,first shut the water off to that bathroom@Ryan Collins,first shut the water off to that bathroomdisconnect the bathroom fixtures and towel supportsprotect the bathtub with some cardboard or old towels/blankets (hard to refinish smooth porcelain finish)next you need tool (clicky-link) . basically a wide chisel. + a hammer + gloves + eye protectionand construction grade garbage bagsyour multitool is useful if you cut trough the grout and backerboard to break it into smaller chunks, (preferred method of tile pro's) but YOU HAVE TO KNOW WHAT IS INSIDE THE WALLS so you don't cut a pipe/drain/electric.you put the tool/chisel at 30 or 45 degree by the edge of the tile and after 2-6 hits it should come offafter the first 10-20-30 you will get in a rhythmcheck the lower edge of the backerboard for water damage. if yes, replace, they come standard in 3ft by 5ft sheetsdo you want to replace the bathtub or just refinish (everything is in the prep work)?