How to clean the sofa with stains？

For small stains can be wiped with a damp cloth; for a large stains, the back & seat cushions and side pillow covers can be removed and machine washed.

Is it comfortable to sit on? Can it be used as a living room sofa?

Let's say 1 to 5 stars represent the sitting comfort of the sofa. 1 star means firm and 5 stars means soft. We define the comfort level of this sofa as 4 stars. As living room sofa? Of course.

How wide is the seating space of the couch? Can I lie on it?

Seating width 61.8 inch, seating depth 22.8 inch, seating height16.5 inch. It is perfectly adequate as a place for you to rest during the day.

Is it easy to assemble? Do I need to prepare additional installation tools?

It only takes 2 people about 15 minutes to assemble. Detailed installation instructions and a full set of installation tools are included in the package.