You'll probably need thicker strings to compensate for a shorter scale if you want to keep the same string tensions. Other than that there's nothing inherently wrong with short scale guitars. But like any guitar you want to get something with decent quality if you want the best experience.
The downside on them is they're generally (and unfairly) thought of as toys or cheap kids guitars so you don't see many outside the custom market that are high quality. What I've seen on the Ibanez Mikro is build quality is usually pretty decent, but hardware is in dire need of an upgrade.