I can't help with the room size of the Cat 4.
But, I can talk about the four "larger" Cat 3 rooms (8032, 8034, 8532, 8534).
We were in 8032 last August. There is plenty of room in that suite for a crib, either between the bed and verandah in the BR, or any number of places in the LR.
As far as concierge service goes, here were the perks we got for staying in that room:
-prebooked Palo's a few weeks before boarding over the phone.
-preboarded, we were the second family on the ship!
-private check-in at the port, no waiting.
-no waiting in line at the port, we sat in a comfy area and there were pre-boarded.
-once onboard we were directed to Sessions where we were able to book all of our spa appointments (and shore excursions/Palo's if not already done) in the comfortable seating area..there might ahve also been snacks and sodas, I can't recall. They had definitely blocked off some of the best times in the spa for concierge guests. We got excellent times for the Surial as well as a manicure and massage. (They did have to call for the manicure, as I wanted it during a time they didn't have blocked off for concierge guests, but it was no problem)
-Room had an initial setup of sodas and bottled waters. Cat 3 doesn't get replenished, 1&2 do through the week.
-Room was HUGE! Walk in closet was probably pretty close to the size of Cat 12 rooms!
-Room had VCR and CD player with Bose speakers, large tv in LR and second tv in BR. They offer a selection of movies and CD's to borrow as well...I brought some of my own CD's, as I didn't think they'd have much of the type of music I listen to (which they didn't--I like hard rock/metal/new alt)
-The four "large" Cat 3's have TRIPLE WIDE verandah's.
-Comfy robes provided in walk-in closet.
-King bed, true king not twins puched together
-TWO bathrooms. Smaller bathroom had sink, toilet, shower. Larger was split with sinks and jacuzzi soaking tub and double sinks in one room, shower and toilet in the other. Dressing area with vanity and chair off BR.
-Concierge delivered a treat each day, cookies, cheese & crackers,Choc covered strawberries, fruit bowl, I can't remember the others.
-Our DS got two $5 cards for the arcade delivered at least once, if not twice during the cruise.
-Daily calls reminding us of reservations and tips on shore excurions, etc.
-They visited a couple times to make sure we were having a great time.
-Not sure if it made a difference, but out steward was EXCELLENT, the cabin was spotless--even the white glove test on door frames couln't find a speck of dust. He was also VERY unobtrusive.
-Books in the bedroom bookcase on the Caribbean, the stars, knots, all sorts of other interesting things. I actually skimmed through a couple of them. (Might not be a big thing, but it was the "little things" that made it so wonderful!) There were also some alphabet blocks in a basket on a shelf in the LR...believe it or not my 16 DS took them out and was playig with them for a few minutes before dinner one night LOL!
-Did I mention the huge walk-in closet and tons of storage? We couldnt' have filled every drawer if we had brought 10 suitacases with us!
-Easy to get to outlets (one is in the cabinet under the TV in the BR)
-REAL blowdryer in the vanity!
I'm sure there are other things, but that should give you a start. It was our best vacation ever, and we loved it so much we've booked the same cabin for back-to-back sailings in 2004!
Anne