Welcome SpanishHouse:
The tile is beautiful; I like the bright, bold colors. I would think tile can be applied to any sound masonry or concrete surface including stucco. Where the stucco is cracked you will need to see if it is begining to loosen up from the wall. Otherwise, clean the crack out, getting any 'soft' material out and re-applying new before any tile work. If the stucco is turning loose, so will the tile.
Glenn
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