I did a high end condominium on the oceanfront last year the bathrooms and ensuites were both heated floors and they used tumbled travertine there were 32 units so there was quite a bit of trav used as a few clients also wanted their kitchen floors the same,after setting the trav and doing a major grout job because you have to fill all the holes the effect of the grout in the tile as well as the lines themselves was great,I sealed it twice with a matte enhancer and not one client complained,like I said even I was impressed with the finished look.so if you can get tumbled trav at a good price go for it,treat it well and grout hard,I'm sure you'll be happy.