Celebrity is my preferred cruise line. I, like Lena, have never sailed in Retreat on Celebrity so, I am not making a comparison. Pre-pandemic we sailed in YC on Seaview in Europe. We LOVED YC. The only negative - it is much too sedate in the evenings. The music is lovely but some nights I needed a different vibe to mix it up. Once you leave the YC there is a lot of fun to be had on the other side of the door. The event staff threw great parties at different bars and lounges throughout the ship, silent discos and the White party just to name a few. The Europeans party late into the night. So much fun!!! More fun than I have had on any evening on a Celebrity ship. But the beauty of YC is when you can't play any longer you can go back to your quiet, little enclave. I would probably not book outside YC either, as I need that happy place to recover from the times that I venture out.
On another note, thanks to Charla for posting such amazing reviews!!! I have enjoyed all of them. I am longtime lurker but this is the first time that I have chimed in. Please enjoy your last few days on board!!!