Context: we stayed 2 nights at the end of 3 week holiday so admittedly we had some travel fatigue but also not as luxe as other VRBOs we've used on this trip. I would have booked a hotel if Boston wasn't so expensive.
The stairs are as described; truly narrow and steep so be mindful of your ability to get heavy luggage up two flights.
Pros: centrally located, walkable neighbourhood, affordable
Cons: bed too hard and hot, amenities lacking (half empty soaps/shampoos, only two towels provided, women have hair to wash/dry), too much light in bedroom, noisy neighbourhood next to fire station (I get it, emergencies happen, love a host that provides earplugs).
Like I said, it was fine for two nights, especially given how expensive Boston is, but after 3 weeks away from home, I was wishing I was in a more comfortable bed, with better curtains and linens.