Success luxury apartments are not in zadar. They are about 5 miles outside of the city. However they are very well furnished and very comfortable. We had a 2 bed appt which was pretty large. Kitchen was well equipped. From making the reservation the manager franko was in touch. He arranged to pick us up from the airport and due to the time of day we arrived and no shops open took a shopping list from us.
We arrived in April. The season in croatia doesn't really start till May, as such not a lot was open. The one and only bar opened but was not serving food. However the staff at Santorini were very pleasant.
Kozino is a new development with lots of apartment blocks set at the side of the sea. It is very picturesque and the local people are very welcoming. However being self catering there is not a substantial shop/market for your needs. You will need a car if you are staying here. The buses are not frequent and no apparent timetable. Zadar itself was a taxi ride away and costs approx 13 pounds each way. Petcarne is the next village along the coast line and is a 30 minute walk. It's a lot busier and has a number of restaurants and a sandy beach.
Myself and Girlfriend fancied a last minute getaway to the sun and booked the Falkensteiner apartments. The apartment is airy and bright, and was exactly what we wanted. Its relatively spacious, apart from bedroom which was smallish. The pool area is lovely and sits right up against the Adriatic sea which is beautiful. There is a sand beach (uncommon in these parts) 150 Yards from pool area, which is great for kids and young families, and nice for a change of scenery from the poolside loungers. The area itself is quiet and calm, but has a few nice local eateries, as does the resort itself. We spent half of our evenings in Zadar so as to have more choice for eating and going for drinks. Overall food was excellent, especially fish options. Try Bruschetta restaurant or Tinel if eating in Zadar walled region, both beautiful. Wine was cheap and terrific, with staff in many restaurants giving advice on food accompaniment.