Firstly when it comes to both of those you need to find the paint and tile you like.
A good indoor paint can be had for as little as R800 a tin but that'll just be a silk sheen in the colours it comes in, you'll need about 6 tins to paint the entire 190sqm. You could just clean the walls, fix the cracks, patch holes which will save you a lot and then paint over the existing paint.
Don't see that being 30k unless you hire a really expensive contractor to do that who will more then likely just get the guys off the side of the road.
Tiling is where it can get expensive, the tile you chose, the fitting can be R50 to R180 an sqm depending on contractor. Some will do the removal in the R180 some don't. Then it's also disposal some charge for it, some don't, tiles range from R59 to R400+ a sqm.