If this house is 40% larger than all the STR in area expect to be the party house and use porcelain tile floors, concrete polished countertops and indestructible appliances. 

I prefer porcelain tile over LVP, it lasts just buy extra pieces- place un-grouted under sink in bath and kitchen for spares.

Cheap way:  Silicone hole- let dry- then with a porcelain touch up kit, touch up the silicone area.  

I'm planning on using Luxury Vinyl Plank (LVP) throughout each apartment, and was wondering if I should switch to Porcelain tile, LVP, or LVT in the kitchens and bathrooms?

No hammers near the porcelain.

. = $220 at MenardsTub $275 at LowesTub surround $220 at Lowesor Tub Porcelain tile surround 60 sq feet at 2.00 = $120 + mastic and grout $100 at LowesFaucets, towel racks, and such $300 at LowesSo about $1500 in materials.I'd normally pay about $300 for demo. $200 to lay the flooring, $1000 to set the vanity and vinyl tub with surround and $200 to hang light, mirror and towel racks.

A plain porcelain toilet will do.;-) Since you don't mention the scope of work, (roof, termites, AC, water heater, flooring, cabinets, etc) it's hard to get too specific on reno costs.

Total renovation with new appliances and cabinets in kitchen and bathroom including all new laminate flooring throughout and porcelain tile in bathroom.

Total renovation with new appliances and cabinets in kitchen and bathroom including all new laminate flooring throughout and porcelain tile in bathroom.

Cast iron tubs have a porcelain enamel finish and it will also eventually succumb to harsh cleaners and abrasives.Both type of finishes can be "renewed", but it is an added expense.