All airlines used 2-3 seating in their early 707s. Until the jets (with their greater capacity), most airlines used their new types (DC7s, Connies) for all first class, and economy class was on older planes (DC3s et al). The early 707s was half-and-half. The reason for the two overwing exits on each side is cos the forward of the two would be at the back of first class and the second window exit (three windows further aft) would be at the front of tourist class (as it was then known). And you know how back those exits are, so you can imagine how big first class (2-2) was.
Pretty much the same lavs, just a bit older looking - probably one of the most futuristic part of the plane to passengers in 1959, although all of the 707 interior must have looked like something from a sci-fi movie compared with the DC8 with it's big and badly-spaced windows which meant inconveniently inflexible seat pitch options and curtains (yes!).
I don't know for sure but I would lay money on the probability that the initial layout for TWA and everyone else came with fold-down tray-tables.
fly Saha Air 707s daily from Tehran's downtown Mehrabad to Mashhad, Kish Island and Ahwaz