Long week-end in Zagreb, comments and tips pls :o)

Dear All,

We are planning a long week-end trip to Zagreb with my wife in the next coming weeks travelling from Vienna.

Do you think that three full days are enough for right sight-seeing, shopping and relaxing?

I will appreciate your tips on the above. What about prices? Is it like other Eastern European capitals?

Many thanks in advance!

Best wishes,

Alejandro