When it comes to any safety/crime related issues, it's always best to contact the local police department with all your questions, hear all there is to hear firsthand. If unfamiliar with the area(s) do revisit more than once and at different times of day, possibly chat with locals/neighbors. Real estate professionals are prohibited from steering, enticing a buyer to purchase/rent, or not, in specific neighborhoods.
That address is in Milwaukee's 4th district. They can provide detailed crime information for the area and can be reached at 414-935-7242. If you call during the day you should be able to connect with the Community Support officer.
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