Realtors do not keep that kind of data. Your best bet is to check in with the local police department. This is a link to the Houston Police Dept web site with current information. http://mycity.houstontx.gov/crime/
Many items regarding "safe" also includes communities that feature 24hr manned entry or access gates. Many properties have security systems or burglar bars. Those kind of items a Realtor can search for. You can also do a search on the internet for sex offenders that might be living in the area.
I hope this information helps. Most of the properties in Memorial Oaks sell in the $110,000-$200,000 range depending on size. Most leases are in the $1100-$1500/m range. If buying, make sure the lender can provide a loan for a "condominum" community. Let us know if we can assist you in finding your next home.