The terrace is an absolute dream, it makes the stay 100% worth it! The apartment has everything it needs and is really cozy and comfortable. Good location, really close to the Vatican and Trastevere, which is gorgeous and buzzing, especially in the evenings. You are next to San Pietro train station, which is very well connected to the rest of the city. We walked pretty much everywhere to make the most of Rome, and within 45 minutes you can be in the center (Piazza Venezia, Foro Romano, etc.)
If you are taller than 180cm prepare to stoop when inside, but if the weather is nice you will always be on the terrace, where you can also have a nice barbecue. Would definitely recommend, and the sunsets make it all even more special!