OK, yes, this is a rather vague question, and many will say it depends on the resto and style (ie cafe vs. fast food vs. high end), but I am a stickler for great service and I want to know where your absolute best service experience has been in town, regardless of the kind (or quality)of food served.
My top three picks (recently visited) are:
Zumaia - Friendly and knowledgeable service--complete knowledge of menu, great suggestions, prompt but not rushed.
Casa Tapas - we always go with our 4 year old and the servers always treat her like a princess.
Ben & Jerry's Monkland- the smiliest bunch of ice cream scoopers I have seen. Almost makes me forget the scandalous price we are paying for a scoop!