We use to have an AF 1140 and we ordered it with the sofa in place of the dinette table. It had an long table on slides so you could get into the couch and then pull the table closer to you. I didn't like that long table as if you wanted to take it down you had to store it some place and about the only place for it was on the bed. It had 2 posts for it to set on so I maked up (from butcher block cutting boards) a couple of small tables. One fit on each post so each of us had our own little table that could be used for eating or our computers if we so wished. This way if the other one didn't want the table up they could take theirs down and have a nice lounging area. The little tables were not hard to store when you did want to use them.
We never had a problem with the direction the couch faced as we had a window right behind us plus a window at the end of the sofa to look out of. The thing of having a window at your back would have been the same if we had a dinette as when you were sitting in the one booth the window in the back of the rig was at your back and you couldn't see out of it.
If I ever get another camper it well most likely be a 1140 with a sofa again. I really miss having the sofa. Would have loved to had it on our Alaska trip last summer as there were days when it was cold outside and then we went from that right to 96 to 98* weather in Fairbanks. When we came back from sight seeing all day and were hot and tired it would have been nice to sit in the camper with the AC going and some comfortable seating also.