If you are looking for a new bed but is short on space futon bunk is a good choice. Bunk bed futon can be used as a sofa during the day and then be converted into a bed to sleep. They are inexpensive and come in many styles. Bunk bed futon come in a variety of different frame styles. Many are metal, and these come in all colors of the rainbow. Other frames are wooden and can be found in many different finishes.
You can find a framework to complement any decor or theme. Depending on how much your bunk futon will be used will depend on the mattress you want to buy. If used daily, obviously you want a good quality mattress, spring possibly interior, although more expensive last longer and be more comfortable.
If only the futon for guests with less regularly used you may want to consider a cheap mattress. There are many different covers that you can get for your bunk bed futon mattress. Remember, for ease of use, you may want to choose a cover that can double as a bed cover. This way you can convert from bed to sofa easily without much commotion.