"Would be lovely if not for the expressway running alongside it"
I live a little bit south of this street, so I always cross it on my way into Park Slope proper. And while I think walking across overpasses is rather pleasant, I wouldn't want to live along this block. Until the expressway diverges, Prospect Ave. runs alongside it for a good while, and I can't imagine what the noise would be like. Plus, the traffic can be a little bit dangerous, so it wouldn't be a good place to raise young children. However, sometimes flaws like these can make the apartments on the street cheaper, which is a plus to young singles who don't spend a lot of time home anyway and are just looking to save a bit of money on rent. Needless to say, the area is filled with businesses of all kinds, from excellent restaurants and bars to locally-run stores selling just about everything. Very convenient to transportation (subway stops on Prospect).