No reason it cant be with appropriate furnishing, what size is it?
It looks very much like the cheap aquarium/vivariums available around here which I use from time to time. Two pieces of advice, the top isnt secure enough on its own to keep some species in(I can tell you from experiece climbing frogs, pacmans and Anoles can get out, though I wouldnt think it a problem with a small newt) and terrestial live foods will escape(crickets, flys, ive even had earth worms crawl up the sie of the tank and out the top). I tape a fine mesh(metal or several layers of fabric) on to the inside of the lid to prevent it and duct tape/weight down the whole lid with species that can force their way out.