What a GEM! Casa Cosi appears to be a collection of flats that the owners have refreshed and operate as a boutique hotel (in some ways). Our unit 21 is was on the 3rd floor, and had 3 beds and 2 baths. There is a small "shared space" for kitchen and dining room, but there is no living room. Given how much time you'll be out and about, the space works great.
The beds were very nice, and the linens were clean and soft. In general, the entire place looks to be furnished at ikea, and its perfectly lovely.
The feedback and communication from the staff is great. Super quick.
There's a bit of scooter/street noise but nothing outrageous. If you're from a city, you wouldn't notice... if from a quiet town, maybe you would.
HIGHLY recommend!