Chose first for destinations, secondly because it was Oceania....previously on the Marina, and loved the ship. Cruise Director on Sirena was far superior to the one on Marina though.
Meals and service in Red Ginger and Toscana were very good. Too often we had to search for a seat in the Terrace. For most part service was excellent; the odd person appeared to hate their job and it showed.
Wine especially was very over priced for the quality. On the regular winelist we found our go to wine at 4 times what we pay for it in Hawaii. Doesn't Oceania buy 'duty free'? cocktails at two for one still worked out to regular price for each in CDN dollars, so no bargain there.
Loved Barcelona...arrived 4 days prior to cruise and would definitely recommend.
Walked around Cartagena on our own. Lovely port
Loved walking around madeira.
Stayed on ship; however heard from others that it was well worth the trip to see how their grape vines are grown, so different than everywhere else.