Welcome. You need to check the build date on the driver's side door sill sticker. If it is before April of 2013, then run - don't walk - away from the car. The reason is that pre-April 2013 Leafs have batteries that look the same as later ones, but use the old, terrible 2011-2012 battery chemistry. One of those "Canary" batteries would not hold up well at all. Later 2013 cars have batteries that hold up much better, although not well enough in hotter climates. Anyway, I'm going to link my used Leaf buying guide, and ask you to put the City in which you are located in your user profile - or at least tell us where you live, by city. That will help us to answer your question.
https://www.mynissanleaf.com/viewtopic.php?p=538030
https://www.mynissanleaf.com/viewtopic.php?p=538030