A 'nest' is indeed a very accurate description of the small, but well-equipped apartment of Arabella. Milan is big, but you're very close to the Central station and a variety of good bars (did not get to sample the restaurants in the neighborhood).
While not big in surface area, the place is definitely large enough to act as a base from which to explore the city for two. Amenities are there, including a first morning coffee and snack to get you going.
The building itself is, as written, a nice representation of the Milanese buildings, with a lovely inner court and balcony-access apartments around it.
Communication with Arabella was effortless and clear. Would definitely recommend the place.