It seems that wherever we visit, it doesn't take long for us to wind up with a new favourite coffee shop. In Lancaster, it was most definitely Cafe 18, a Mennonite-run cafe which we visited a couple of times on our short visit to the area.
Their coffee was excellent, and with unlimited refills I could try all three different blends. And when we returned for breakfast the next day, the breakfast burritos (a new concept for me!) were filled to near-bursting. I tried to recreate these at home but haven't yet figured out how to get enough filling without it actually bursting out of the sides, which is somewhat less attractive - if anyone has any tips, I'd appreciate it.
Meanwhile, if you're visiting Lancaster, I'd definitely suggest dropping in at Cafe One Eight - our only complaint was that it's a very long way from where we live!