Not in the Northeast , I’m in L.A but I am sure you will find a ton of investors from your area .BP Does have forums for specific local areas too this is the one for New Hampshire . https://www.biggerpockets.com/forums/571-new-hampshire-real-estate-q-a-discussion-forum

Anyone else over in the North East, specifically New England area?

There may be a 25 - 40 year difference in age of the homes.

Also what specific dd services would you want?

Specific tips will depend on the nuances of your market, property type and property and I would recommend talking specifics with local pro's (brokers/investors) to get their opinions based on the property type/market you're focused on. 

Would love to get some opinions on self managing vs. hiring a PM, specifically in the Boston area.

Specifically how to  do it I don't know.

My Pm handles this so I can't help too much on specifics but I can tell you the judges here are way more sympathetic to the landlord so file early and file often.

However, a broker will get you much further.As for a broker in your area, there will be different brokerages that are stronger in specific types of product.

In fact most the big guys I know are using customized rules for their specific buying criteria.