My parents had some leather furniture (sofa and loveseat) when I was growing up. The only trouble we had with them is that they are man-eating. Once you sit down, you need a couple of friends to get back up!
If you spill liquid on them, wipe it up immediately.
Keep sharp objects away (good idea for any sofa, actually).
Will let you know if I think of anything else.
Enjoy your new furniture