@Emily237, we do Airbnb in our cabin and rent out our downstairs area in our home on a month to month basis to a regular tenant. I can tell you there are positives and negatives to both.
First, I would cover the legal basis and make sure that STR are allowed in your building. Then, do some research on the website AirDna and find out what the market looks like with the data. If both look good, and it is affordable for you to furnish the space well, I would consider Airbnb if you enjoy meeting new people and if you can keep costs low with doing your own cleaning and such.
Renting the room to one person longer term of course has the benefit of not having to reinvent the wheel every few days, but also, can be awkward if you get the wrong person in there, so do your due diligence if you decide to go that route and do it properly with an interview, background/credit check, references, etc. Also, if you go that route, do month to month and a contract stating either party can terminate with a 30-day notice, assuming that is the legal standard in MA.
Do the research on AirDna, which is $19.95 for a month I believe and also if you choose to go longer term, do your research on Craigslist and such to see what area rooms are going for.
Good luck!