We just returned from the 4 night cruise aboard the Carnival Paradise. This was my first cruise and my husband's second (he was on the Carnival 3 day to Mexico several years ago). We really enjoyed the trip and would highly recommend it for people looking for a short, affordable cruise.
We booked an inside room to keep costs low. We were pleasantly surprised by what a nice room it was. The room was larger than we expected and it was very quiet. Our cabin steward made our bed and straightened the room nearly every time we were out.
Embarkation was quick and smooth. I had read you could arrive early so we got there around 11:15 and were on board in less than 30 minutes. This may not work every time- I think it depends on how disembarkation has gone for the last cruise.