The location of this apartment is perfect, in my opinion, the best place to stay in Rome is near the Spanish Steps. The apartment is also a close walk to the Spagna subway line and has a Carrefour Express next door. The apartment is a good size, very safe, extremely clean, and quiet at night time. The one minor issue is the hard bed, so if you are very picky about this, it's something to consider.
In terms of host, Guilia was excellent! She arranged our transfer from the airport as requested and met us early in the morning, before the check-in time at the apartment. Her partner helps with the luggage, so the fact that there is no lift is not an issue for those worried about lugging suitcases up 2 flights. There is a handy Nespresso machine (she provided some pods for the week) and many useful items in the fridge (some drinks, a mini bottle of bubbly, butter, and few small snacks). We stayed for a week and she came in to clean mid-week, which was really great. She responds almost immediately to any queries, which was greatly appreciated. Overall, I would stay in this apartment again based on location, cleanliness, and host!