Assembly took about 2 hours for 1 person and was pretty straightforward. There are a lot of parts but theyre labelled well and all the pieces and holes lined up.

The mattress is not a standard futon mattress. It has a top and bottom side and there are spring supports in the bottom of it. Its comfortable to sleep on. 

It is ok to sit on but doesnt seem super comfortable because of the angle of the back and the seat. This may be adjustable or get better over time, Im not sure. Its great for laying down on or sleeping on.