The case for treating the windows may be overstated in this instance they don't go from floor to ceiling and in fact appear to stop practically above the height the tops of the speakers are set at.. one anecdotal 'no-no' is putting speakers directly in front of panes of glass (i.e. rear of spkr cabinet in front of a window as opposed to a wall) but that doesn't look like these windows will affect filper's setup in that kind of way at all.. there's said to be issues with the way sound reverberates around the space with reflections Vs absorption of glass but again it's not like the room is one big glass box or has an entire wall of glass running down the LHS.. if you were gonna get picky you might be more concerned about the open plan/lack of wall running down entire length of RHS of the pic but really with room correction in a 5.1 system nowadays I doubt you'd have any major problem.. no, I bet it'll sound lovely, lively and open, airy and scrumdiddlyawesome! Great space, probably the best upgrade one can make to a system is to move to a bigger/better pad!