We are looking at booking a cruise and I am looking for advice if we need to book an extra room for the kids and if this is okay or even safe to do. I am not sure if the rooms accomodate 4 people or not?
It's up to you, but I would not be comfortable having kids as young as yours in their own cabin. We sailed in a quad room twice on Carnival; it was tight, but I liked having the entire family together in one room. Another option would be connecting rooms (like some hotel rooms, where you have a common interior door you can just leave open). Quad and connecting rooms are limited on most ships and tend to sell out faster with all of the families sailing. Go to a TA and get brochures of the cruiselines you are looking at (or just check their websites). The deck plans will show which cabins are quad or connecting. Here's a picture of our quad room on the Carnival Elation. Have fun planning your cruise.
We have been getting connecting cabins on our last couple of cruises. The first time our kids were 9 & 11. We really like the additional space and the chance to have a bit of privacy - kids feel the same way! The downside is that it is more expensive, but it is worth it to us. I wouldn't recommend, cabins that are not connecting. I don't like the idea of not being able to easily monitor what is going on in their room. This would be true of any aged children.
With the ages of your children I would go with either a connecting room or all four of you in one room. In my opinion 6 & 12 are too young for their own room. If you do decide to get them their own room, get one right next to yours or across the hall. A baby monitor works great for keeping track of what's going on in their room.
Celebrity Century 1/09
Carnival Destiny 10/07
Carnival Destiny 9/06
Monarch of the Seas 3/06
Carnival Inspiration 8/05
Carnival Miracle 4/05
Carnival Inspiration 4/04
Sovereign of the Seas 4/03
We've booked connecting cabins on the Monarch. We'll see what it's like when we sail in Sept. My kids are 5 and 13. Our TA said it was the best way to go and you have 2 bathrooms! You don't even need to book an adult in each of the rooms (ie--DH and Son in 1 room and me and DD in other) as long as the rooms are together at least that's what our TA said.
It was less expensive to do it this way verses a suite--even a JS. I was at one point thinking about a JS but thanks to the boards I found out that it wasn't really that big and getting 2 connecting rooms would be less expensive besides being a little larger AND having 2 bathrooms!