This was my second cruise ever. Grew up around boats; and have zero interest in the enormous new ships. I want to see the ocean at all times. Grandeur is Royal Caribbeans "Vision Class," and has acres of windows. It is very easy to get around. I never used the elevators.
Previously I cruised in a suite; this time I wanted to see if the cheapest cabin on the oldest ship would suit me. The fare for five nights was a real bargain and children were back in school, the crowd was a very nice mix who "kept it classy" for the most part and were very tolerable. School holidays/Spring break are most likely a different story. Short answer: Yes, I enjoyed my interior cabin and the cruise very much.
For me, the high points were the food, music, staff, and overall vibe of the ship. The teak promenade deck was great for relaxing with a book and a drink. I don't smoke, but there was ample smoking area for those who do, to feel comfortable on their vacation. Live and let live.
Cabin was clean except for the mirror and the TV screen, I informed my steward Wendy and he took care of those issues immediately. Bathroom was very clean and functional. Shower was small as expected but I am not a large person. The combo body wash/shampoo was fine. Bed and linens were very comfortable. Storage was excellent. I loved the darkness and quietness of the cabin for sleep. There is no mini-fridge but Wendy filled my ice bucket twice a day. I brought a bottle of wine and some Fresca and Coke Zero on board in my carry on.
I enjoyed both ports. Key West has a lot of history within a short walk from the pier. The sculpture garden in Mallory Square is a must-see.
Labadee was well-tended. Several small beaches. The Dragon Tail Coaster and the Dragon Breath zipline were fun to do with great staff. I was accidentally charged twice however; check your account the last night of the cruise. If there are any errors, it is far easier to have them fixed while onboard than from your home after the fact.