Very well-made, sturdy bed.  I chose to get a thicker mattress for the top, but stuck with 9" mattress for the trundle as advised.  With the 9" mattress, it was difficult to push trundle under bed, so I recommend going with 8".  (I will be raising bed with casters or extenders to accommodate the 9" better.) The installation instructions were entirely visual, so they are good regardless of language. Just pay close attention to details in pictures, particularly the orientation of each piece and the placement of trundle wheels on INSIDE of end piece, not on outside.  (If placed on outside of end piece, they extend out and make the trundle too long to fit under bed.)