I would say the above definitions are fairly accurate. I would not recommend people live in Bensonhurst- it is too small of a community, with very judgmental attitudes, not friendly towards outsiders/BT’s/gerim, and for American non-Haredim, it is a wasteland. The community is centered around the yeshiva.
Kensington I consider part of Boro Park, even though geographically, I am probably wrong. The community there is wonderful, and even the Conservative shul there has a mechitza during the week.