Croatia is beautiful with wonderful sailing. We sailed with Navigare and the boat was well equipped and we had no problems. Provisioning was easy with good selections. One caveat was that the very first thing the charter office asked for when we checked in was my "license". I have IPC (International Proficiency Certificate) issued thru US Sailing. Lots of marinas and town quays for support if you need it. Watch out for buras in summer but generally very easy sailing. We had winds from 0 to 25 knots a year ago September. Let me know if you have other questions.
-Dave