Hi lots of questions ;-)
Firstly, prices are not falling in dun laoighre. Expensive place to buy.
Facilities- dun laoighre is geat for shopping, walks,restaurants,cafes,theatre,cinema. You need to get to know area to find out good pubs and areas to avoid.
Schools are very mixed in dun-laoighre area, as school policy must enroll all types of kids in recent years. Some private schools have stricter enrollment and are expensive to enroll in.Depends what you are looking for.Catchment areas has caught on in Dublin so most insist on living within short distance of schools these days.Many send children to school on the dart line too.
Library in dun-laoighre is small which is disappointing considering size of area.
I'd widen your search area for a house and make sure you get to know surrounding areas before purchase.
Colleges have good reputation in dun-laoighre