This was my first cruise (as I am only 20). I went with my boyfriend of 4 years (who is 21) and we stayed in an inside cabin. Embarkation was really fast and easy!
We booked the cruise through our college and so were rooming with 2 other people. 4 people was kind of a lot for a small cabin, but it wasn't too bad. The only bad thing about the inside cabin was that in the morning you couldn't tell what time it was (no sunlight) so once i woke up at 4:30AM and had to get up to see the time. I doubt it would be worth the extra money though- to have a window. I spent very little time actually IN the room.
The ship was beautiful! Everything was brand new because it had been dry docked. The first day on the ship was relaxing but a little cold. (we had ridiculously bad weather the entire time...but i guess im just used to sunny california weather!).