There are several important elements to consider when designing a children's common bedroom, but one of the most important is creating a safe and functional space that meets the needs of all children sharing the room. Here are some specific elements to consider:

Safety: Safety should be the top priority when designing a children's bedroom. This includes ensuring that furniture is sturdy and secure, that electrical outlets are covered, and that any potential hazards are addressed.

Storage: Children tend to have a lot of toys and belongings, so providing adequate storage is essential to keeping the room organized and clutter-free. This can include shelves, bins, and other storage solutions that are accessible to children of different ages.

Comfort: Children need a comfortable place to sleep, so investing in quality mattresses and bedding is important. It's also a good idea to provide pillows and blankets that are appropriate for different ages and sleep preferences.

Personalization: Allowing children to personalize their space can help them feel more comfortable and invested in the room. This can include allowing them to choose their own bedding or decorations, or creating designated spaces for each child's belongings.

Flexibility: Children's needs and preferences can change quickly, so it's important to design the room in a way that allows for flexibility. This can include choosing furniture that can be easily rearranged, or creating spaces that can be adapted to different activities or needs.