a) Environment - is it convenient for your work, your children's study or your family's daily life? Also visit places during the daytime and on an evening to check lights, noises, etc.
b) Property management - is the staff responsible and polite?
c) Security guard -Can they help you when you have any questions?
d) Neighbours - Are there many families living there?
e) Landlord - is the landlord hospital or hostile? Is he/she willing to help you when you have any trouble?