The Unit: If I could describe the unit with two words only, I'd say comfortable and luxurious. Building is secured, very authentic and beautiful and the elevator is antique looking: it's a treat. The common area in front of the unit gives an extra sense of security. The unit itself is very well designed - you can feel a 'designer's touch' at every part of the apartment. It feels more like your 'own home' more than a 'rental unit'. The kitchen and living/dining room are well designed and lit. The air conditioning works great. The balcony is beautiful, and especially sitting there late at night gives an amazing flavor of what local Italian life is like. The bedrooms and bathrooms are extremely clean and comfortable. High ceilings throughout as well as the big windows and storm blinds (rolladen) help make it a very comfortable stay. We used the kitchen for very light cooking like an omelette and breakfast only, but it's well equipped and very functional.
The hosts: Ugo and Francesca are extremely diligent, responsive and accommodating. If there is any extra step they can take to make your stay better they will do it right away. I'm not sure if they could do the same things for all guests as schedules may or may not allow; but they did so much for us - and it's just the thought and effort which was so wonderful: accommodated our early check in after a very long trip, took the time to explain everything thoroughly including travel tips; gave us some extra treats like nice coffee and toiletries, allowed us to store our luggage after we checked out, recovered and mailed a lost item. They are wonderful hosts with great professionalism as well as a warm touch before, during and after the trip.
Location: We quickly found out that it's one of Rome's exclusive areas, the street and the neighborhood is very clean, surrounded by exquisite restaurants, neighborhood pastries and hotels, as well as boutiques. There are 2 grocery stores which are about a 5-10 min walk.
Transportation: very short walk to the Spagna subway station, from where you can connect to the rest of the city. Similarly you can take the bus from the corner of the street to Barberini subway station. Overall, it's extremely easy to travel. A 10 min bus ride to Love Fountain and 10 min subway ride to Vatican or to Termini. Also fun to explore restaurants and shops around neighboring subway stations. We walked to Lake Borghese almost every evening - such a serene and natural park - instant relaxation from a long day. We took a cab to the airport on the way back - it's a flat rate, and very easy to get one on via Veneto, just by the apartment.

We had a very busy itinerary, but coming back 'home' to the unit every evening to relax, and enjoy its comforts was probably one of the best parts of the day !