I think i can answer that one.

It appeared to me that forward of the wing exit (row 15 i think), the window alignment was terrible – the window came was postioned so that it was mostly obscured by the seat back. But where I was sitting, rear of the exit row (row 18), there was a window, a very large one, for each row.

Sounds like DC-8. Very large windows – 36 cm wide, much wider than the B787 Dreamliner windows, which are only 28 cm wide. But window pitch 1016 mm, meaning that many airlines had 40 inches legroom in Coach just as in First Class.

As for headroom, see

http://www.embraercommercialjets.com/english/content/ejets/emb_195.asp?tela=cross_section

144 cm under bins.
Compare to B737:
http://www.boeing.com/commercial/airports/acaps/737sec2.pdf
page 58

158 cm under bins

or A318
http://www.content.airbusworld.com/SITES/Technical_Data/docs/AC/DATA_CONSULT/AC_A318.pdf
page 22

159 cm under bins.