This was our first time on celebrity (we previously sailed on Royal Caribbean, Princess and Holland). Celebrity is definitely our least favorite. It's not terrible, just underwhelming. The Infinity is an old ship and definitely has a lot of wear and tear.
Pros:
-The entertainment for the most part was very good. The Celebrity Singers and Dancers show was dated and nonsensical but we liked everything else. They bring in a lot of acts from outside that are outstanding (there was a group from Britain's Got Talent that was particularly great). The musicians playing throughout the ship during the day were also very good.
The cabin was nice and in a good location (mid ship, very quiet). The balcony door was broken though and would lock you out if you closed it all the way.
Not a lot to do in this port. It's fine for an embarkation port.
Really nice port. The town of Fiskardo was particularly nice.
We walked around Old Town on our own. Celebrity had a shuttle to take you to old town and back ($12).