What do you call this?

That would be a couch or a chesterfield to me. It would all depend on what type of mood I am in at the moment.

"couch" can have a negative impression on people????

What about "Sofa Surfing"?
A phrase that among musicians tends to be mean, "No place to live, no real job, no money" etc. I've known many Sofa Surfers. :D

I also call it a couch - never anything else.

Looks like a couch to me. :) I don't think I've ever used the word sofa even though I've heard it used.