There are numerous condominiums throughout the town that offer convenience and access to restaurants, banks and public transportation. If some of your interests include walking/biking along the Charles River, there are buildings within close proximity of the bike path. There are some buildings located near Watertown Square that offer you convenient access to the bike path but have the added benefit of being near the public library and numerous restaurants. The east end of town would give you quicker access to the Harvard Square bus and the Watertown Center for the Arts. There is a complex @ 164 Galen Street (1 block from my office) that gives you immediate access to the Mass Pike, the Downtown Xpress bus, and the bus to Kenmore Square in case you are a Red Sox fan.
These buildings offer different amenities, square footage and price points but we have a lot to choose from. Best of luck with your search and let us know if we can help you. 617-923-8355