You need to be detail-oriented and capable of reviewing work for completeness and accuracy. As far as raw accounting skills, all you really need is the ability to read a trial balance, book expenses, etc.. This job will teach you the difference between a debit and a credit, but not a whole lot more. While it's definitely a "real" accounting job, unlike some banks in Boston (State Street), you won't need to break out your Intermediate II textbook for anything.
Additionally, this is a client-facing role. The ideal candidate will be able to speak to clients and manage their expectations, as well as speak to members of other operations teams to finagle enough information to meet client deadlines. Historically, timing has been an issue, but a good Boston-based Fund Accountant is someone who has built enough rapport with other teams that they can get enough information to begin work, even if the "official" signoff has not come yet.
Finally, the office culture is very much results-oriented. You will work late. You will do whatever you need to do to get your reports out on time. If you have that attitude coming in, it's helpful. If you don't, you will not be effective.