Bench with storage
cushions that go up over the window ledge edge more comfy / important because of the window sills in the sunroom like the light colors here Maybe glass table is way to go and allow the cushion colors to carry things. Maybe bright / deep / dark blue that works well with the flooring color in dining area (see if the Clinton blue in the bedroom wall would work)
for creating an entry way, could do this kind of thing with a 3/4 wall that is an open coat closet with storage a half wall that has storage on the backside towards the main part of the home and seating area/storage next to the closet bit
Q