I have been to both Java and Artcaffe's (various ones) and I do not hesitate to wave over the head waiter and be very clear that I expect service to begin with and that I will tip based on quality of service. Some people respond...others don't. In any event, I sit on any area that does not have a clear, "reserved" sign and NEVER hesitate to raise my voice if I am even a little bit unhappy. Restaurants hate embarrassment in front of other clients more than ANYTHING else. Be clear and fair in your assessment. Finally...remember that all these waiters / waitresses are on MINIMUM wage and probably had to beg for their jobs despite good qualifications, etc. THEY WORK FOR TIPS! So don't go to an upmarket place expecting not to tip AT LEAST 10% of your spend. That's just CHEAP! You can go to lots of other places with similar food (eggs, meat , booze, friends, music, etc.) But this is a high-end establishment. plan your spending accordingly!