Paul Berkeley raises an important point - what makes a "good" tenant? From the perspective of a generic landlord or generic neighbor one could list a variety of attributes that could be considered "good". When the specific conditions of Harvard and Allston are considered, those lists could be further refined.
Also, different definitions of "good" might arise from considering the situation more broadly. For example, an over-saturation of any one type of tenant might not be "good", even though each individual tenant when considered in isolation might be "good".
Allston Residents React to Purcell’s New Post The Harvard Crimson