It's somewhere in-between like a hostel and hotel room. Very well organized, clean, welcoming and good vibes. Awesome!
While the terrace does not offer the best of views, it is a very nice touch and offers some daytime sunlight. Just be mindful that there are active offices overlooking the terrace.
It's perhaps not the best of neighborhoods, to put it mildly, but it's in acceptable walking distance to museums and city hotspots.
By the way: Not being able/allowed to put toilet paper in the toilet (there's a trash bin on the side for that) could be off-putting for some but that's just how some of these old buildings are and not to the blame of the host.
I recommend this place if you want a nice room/apartment to spend some time in, are not afraid of dark alleys (figuratively speaking) and are one a budget. Well worth the price! I could see myself staying here again.