The photos are accurate and comprehensive. Actually, the full-size shower is even better than it looks: stone tile and simulated marble floor, with your choice of two shower heads (look for small toggle switch at the top). Plenty of space to spread out, despite all the gear that I brought with. Small touches everywhere are designed for safety and comfort: blackout shades on the sky lights; LED nightlights that cast just enough light to get around at night; motion-detector lights on the front stairway for after dark; 3-way switches on all stairways leading to the top floor. Anything I might have asked for, they'd already thought of.
Mission Hill neighborhood is just off the edge of most tour guide maps, yet strategically located with plenty of amenities. Walk to the green or orange lines in 6 to 7 minutes. If you stop for breakfast at the excellent Milkweed restaurant on Tremont, it's only another 1/5 mile to the orange line's Roxbury Crossing, and a short subway ride to downtown. The Museum of Fine Arts is only a 15 minute walk. A large Stop-and-Shop grocery is on the same intersection as the green line at Tremont & Huntington.
No real negatives, just a couple advisories: the room is two flights up, plus a short stairway to front door; this may not be suitable for someone with mobility issues. Double bed might be too short for a tall person; if so, ask them about the floor mattress (I didn't explore that, since I'm only 5'8"). Altogether, for a city as expensive as Boston, I feel very lucky to have found a terrific space at an affordable price.