Our crew of 4 - myself 28, GF 27, her mother & father in their 40's. It was my first cruise, GF has been on one other and her parents have been on 5 or so all with RCCL. Myself and GF had an interior stateroom and her parents had a balcony across the hall.
Our room was nice enough for the two of us. I ended up putting the small glass table on the couch to free up some floor space though. Everything worked as it should, nice and cool, no weird smells, all the lights and tv worked fine. The bathroom is pretty small and I'd imagine pretty hard to navigate if you're a large individual, shower the same - really small.
Our stateroom attendant was awesome, multiple towel pets, kept the room clean, held multiple conversations with her, shared some of our turtle farm pictures with her - very warn friendly person.
Room is large enough for two people who don't want to spend much time in there. The bathroom is quite small and takes some getting used to, along with the shower capsule. Everything worked as it should, stayed cool in there without any problem. The safe worked, had hot water, tv was fine, and all the lights worked. Make sure you bring a watch or clock with you because these interior rooms are DARK, I slept until 9am the first morning by mistake because it was so dark in there.