NEGATIVES
Kinda small - works more like a bachelor than a one bedroom. There were some very small ants - not really a nuisance but our stay would have been better without them. Stairs - although technically on the fifth floor, the high ceilings make the climb more significant - probably more like seven flights, although there is a lift for luggage.
POSITIVES
Daria - she will take the time to scope out things that interest you, where to shop for groceries, get a massage, fitness spas, etc, etc, etc. She is really a superb host, and makes the Airbnb model work brilliantly. She cares, she responds.
The terrace - although we were there in February and so had little opportunity to use it (we were there for the Beast From The East and got 10 - 15 cm. snow) it is large, cozy and very private.
Quiet privacy - I am not sure that there is an apartment in Rome with more privacy or more quiet. Although smack dab in the middle of the city (150 meters from the top of The Spanish Steps), being on the top floor does have its benefits.
Location - central to everything, including the subway. Easy walking distance from the Forum, the Colosseum, the Monti neighbourhood, the Vatican, the main train station, shopping (via del Corso, via del Babuino, via dei Condotti) and countless eateries of all types.
SUMMARY -if stairs and a few small ants don't bother you, you can't go wrong with Daria's place!