I assembled this by myself (33yo woman). It was easy and the final product weighed just enough to be sturdy but light enough to move aroubd as needed. My 6 year old son loves this deskbed combo. 
The ceiling in his room is 10ft high. Any lower and he would hit his head if he sits up in bed. 
I recommend this bed for an agile child and one who is not afraid of heights. You have to climb over the side rail to enter and exit the bed.