tommud,
There are several towns right next to BC that might be very pleasant to live in. The City of Newton (directly adjacent to BC) is a very large suburb. It's a very safe and comfortable community but may be a bit expensive as it is a fairly ritzy Boston suburb. Also, apartments may be limited as there are more single family homes. This is the same for the township of Chestnut Hill. On the other end of the spectrum is Allston/Brighton. This township in the City of Boston has a higher concentration of people but is still relatively safe and closer to public transportation. It is also nearly equi-distant between Harvard and BC. The City of Watertown is also a similar option. Watertown is slightly larger and a little more spread out with more families in the area, but it is further from public transportation and a little closer to Harvard. Finally, there is the City of Brookline. Brookline is a unique city because it is the closest to Boston but is still a separate city. It is a VERY pretty neighborhood, has great access to two public transportation lines, and plenty of shopping and dining. It is adjacent to BC but a little further from Harvard. However, I believe Brookline has the largest concentration of college professors than any other town in Boston
It might be a great atmosphere for your wife while she teaches. I second what Se7enLC said, go to boston.craigslist.com. On the downside, apartments can sometimes be hard to find, go quickly, and can be expensive. Good luck to you and Go Eagles! Feel free to PM me for more info.