Beautiful, high quality bed.  We love that it is low to the ground and gives that modern boho vibe.  We bought an 8” mattress for the bed and would recommend that thickness if you want to see a good part of the headboard (as you can see, we have tons of pillows in the pic, but ordinarily have 4 standard size pillows stacked 2x2).  
We are adding furniture with a slight mid centuring modern style which really compliments the bed and adds to the “clean” look.  
We assembled ourself and had no issues, and we highly recommend the Karr platform bed!