Ekaterina's apartment is in a very peaceful part of town that also happens to be one of the best neighborhoods you can stay in Rome. All major attractions are within ~25 minutes of walking (e.g. Pantheon, Trevi Fountain, Piazza Navona, Vatican City, Trastevere), and the neighborhood itself is an exact replica of Trastevere across the river. There are tons of eateries around the place and they are of extremely high quality.
The apartment itself was spacious and had everything you would need for your trip. We especially loved the balcony overlooking the quaint alleyway below. If we had to nitpick about the place, the ceiling on the second floor where the bed was located was very low and you'll need to crouch to come up. Also, the apartment can be quite dim if you do not fully open the balcony blinds and we wish the bathroom had more storage space - but they don't take away the positives. Ekaterina was also an amazing host who answered all of our questions on time. Highly recommended.