While in Venice, we visited Caffe Florian twice. The first time, because it was on my bucket list. The second because we were tired and we enjoyed it so much the first time.
Right in the center of Piazza San Marco, the people watching is superb. The espresso is good too.
But you need to venture inside to explore the different rooms.
Some seem untouched since the 1700s.
During mid-day you may have to pay extra for the music
(but the bill is so high anyway, you won't notice).
Try to look cool while you soak up the atmosphere.
Take advantage of the photo op right in front of you.
Relax and enjoy watching your 'blooming tea' bloom.
And try to forget the final number on the bill.