The pluses: Good location (between Back Bay and Chinatown)—closest to Arlington subway station, low price, fairly clean, comfortable bed, lots of room amenities (small fridge, room a/c, microwave, toaster, TV, Wi-Fi, blow dryer, iron, desk, narrow shelves, easy self-check-in w/number code to be entered on lock mechanism.
The minuses: Old building w/narrow, crooked staircase (I hope you’re not on the 4th floor), no elevator; from what I could see there was a full bathroom on the 1st floor and on the 3rd floor; there was a very small toilet in a closet on the 4th floor w/ tank & flush handle suspended up high on the wall, but no sink; no room closet.
On the whole, a good value for $77/night in Boston.