Wow!  Super easy-to-follow instructions to inflate the mattress.  You just take the cord out of its compartment, plug it in, press the On button, turn the dial clockwise and it starts to inflate.  Presto, couldn't have been more than 3 minutes to inflate it.  You can stop the inflation at any point.  The mattress is sturdy and well made and it doesn't reek of a plastic smell.  As for the size, I think the measurements provided in the description are not accurate though.  I purchased the twin/single size and it is the size of a real twin/single mattress, but higher.  We are very pleased with this item!