need for window porthole?

I've never cruised before but my wife wants to go one, one specific one in
fact. Its an older boat. All rooms with windows are taken. What we have a
choices of is two adjoining rooms on the inside (B level) or (also on B
level) one outside with porthole but not window, one inside three rooms
down. We have 3 children 6,10 and 11 and the second room is for them. Is
having a porthole a big deal? Would having adjoining room to kids be a
necessity. Should we find a cruise that has a room with a more proper
window. I have a sense that the boat has smallish rooms overall (based on
the fact that this is a fairly modestly priced cruise). Its a 7 day cruise
in Mediterranean.