I only interviewed at prelim/TYs in Boston and ended up matching at my #1 choice. I'm not going to say which one, but if the time comes that you need to make a decision about where to interview/what places to rank, definitely send me a PM. I know people who are either at these programs now, or who have completed their intern years there, so I'm fairly familiar with each one. You won't find a place with more than 3 months of electives unless you head out to Worcester for St. Vincent's hospital.
TY where I interviewed:
1) Brockton - probably the easiest intern year around Boston...medicine blocks make up about half the months and it was typically 9am-2/4pm with Q4 overnight call, though with the new hours they had to make some adjustments to the schedule. Most interns were carrying around 3-4 patients when I interviewed there, and only admitted on call days. The only hard month is supposedly surgery, and that's because its more like 6am-5pm with overnight calls strictly for "educational purposes." All electives are done at Tufts. The ICU rotation is supposed to be fantastic. It is the lowest paid TY...
(2) Caritas Carney (has both TY and prelim med) - only difference is that TY has surgery months, prelim has more medicine months but also more elective time
4 months of surgery, but PAs help with floor work so you actually get to be in the OR. Medicine months aren't supposed to be bad either. If you pick TY, you're stuck doing your ED rotation at St. Elizabeth's hospital, otherwise prelim med does it at Carney. Electives can be done in-house or at local hospitals. Another nice perk is that lunch is provided everyday.
(3) Lemuel Shattuck
2 months of prelim med at Lahey that are really tough months, 2 months of surgery at Tufts (one of which is in the SICU), otherwise really chill. Interns will typically have 2-3 patients while on medicine at Shattuck. Just to warn you, many of your patients will be from local prisons since its a state hospital and there is a lockdown unit with guards (you aren't allowed to go in the room alone, take your cell phone with you, etc). There is definitely a weird vibe to this place...
(4) Newton-Wellesley
The nicest hospital where I interviewed for TY, and its located in one of the more well-off suburbs of Boston. You've got 4 months of surgery, 2 months of medicine, with some night float thrown in. On medicine you typically have around 6-8 patients. All of your medicine and surgery rotations are done with residents from MGH, and noon conference is broadcast from MGH. Lunch is provided everyday at conference. From a strictly educational perspective, this is probably the best TY, but you will also work the longest hours. When I interviewed there, one girl said her first month on medicine she was working around 100 hours per week, although the program fixed things so that wouldn't happen again, even for interns just starting out (who aren't exactly the most efficient). It is the highest paid TY and comes with other random perks like free parking/T pass and gym.
Prelim medicine where I interviewed:
(1) MGH, B&W, BID
I'm lumping these all together since they are pretty much standard academic internal medicine prelim med where you only really get 2-4 weeks of electives. You will work your ass off, but you will really learn to be a doctor. I think it really depends on your future speciality whether the extra medicine months will be beneficial to you or not. Also, MGH and B&W have the highest salaries in the area (for prelim med at least).
(2) Lahey Clinic - I was told to avoid this place since it works you to death during your medicine and ICU months. You get 3 months of electives though...
(3) Mt. Auburn - same number of elective months as MGH, B&W, etc, but medicine months are much more manageable hours-wise