Main risk is that you could be left with a pig in a poke by the time the lease expires.
The trick is to choose one that will appreciate strongly so that by the time the mortgage is paid, you actually have something valuable at the end that's generating a decent income. So the one to pick may not necessarily be the one that's cheapest or offers the highest rate of return. remember 4% of €300K is worth more than 5.5% of 150K so while something might appear particularly attractive at the outset, you need to consider the future. Like everywhere, location is the key.