Here we go. I was in a hurry the other day and I don't find the websites I would looking for. The last one has links to site for each country. I hope this helps you. I found Venice nice because no cars are allow so I didn't have to worry about getting hit. However, the vaporetto (waterbuses) are crowded. We had a nice hotel near the train station. It didn't have an elevator, my mom has bad knees so we got her a room on the ground floor it worked out great.
Embarkation can take a while if you get there are at the regular boarding time. Some people arrive later and the have less of a wait time. I get there early and wait about an hour or so. For disembarking you get a color wait for your color to be called. Once your color is called you get in line to leave the ship. These lines can be long. We drive to port so we don't disembark when our color is called. We hang out in the lounges until everything dies down that we leave. That way we don't have a long line to stand in.