No matter how 'safe' an area is, crime can be present so it is always important for individuals to be aware of their surroundings and not create an 'easy' target for criminals (they are notoriously lazy).
'Safe' is also a very subjective word which is why agents are ethically bound to not make that determination for others.
I would suggest a few things:
1. The local police dept. can tell you if one area has more crime than another because they have the actual crime stats.
2. Do a 'drive by' on different days and times of the week and especially during the hours you are concerned about.
During those expeditions:
Do you see people out walking their dogs after dark? Especially women.
Do you see kids out playing -while being supervised by an adult?
Do the neighbors seem to be aware of you (a stranger)?
3. Check out the Megan's Law websites -these sites are just to make you aware so don't get too freaked out because I can practically guarantee that every neighborhood no matter how nice has someone on the list.
Hope that helps you...