Sailed once previously on Royal. Vision of the Seas through Norway. Was a good experience. At that time the Vision had no specialty restaurants so we ate at the MDR every night and we were pleased with the choices, flavor, service, etc.
Begin by saying that we thought the Adventure was in pretty good condition. Our stateroom (Mini Suite Deck 9) was very nice. Lots of room. Decks, facilities, all well kept.
But the food on the Adventure was a big disappointment. In the MDR there was not much of it (small servings) and so-so taste. Ate in Giovanni's twice. Would not recommend. Was rushed on both occasions and for $25 a person expected a much better meal than what we were presented. Windjammer was okay. Not great, but not bad.
Excellent cabin. Lots of room. Walk-In closet. No noise. Note that the elevators on the Adventure are a bit "screwy". So being close to one is not all that advantageous.