Cheers Shoegal.
It's very easy to find. If you are standing in Piazza di Spagna, at the bottom of the Spanish Steps, you just start walking to your right and it's the next little street to your left.
Also a little tip for you: The anitpasti buffet only costs 10 euro for a heaped dinner plate, and it can be enough for 2 or 3 people to share!
I'm hoping to be back in Rome in September, so hopefully will get to visit it again myself!
JT.