This apartment was perfect for our brief stay in Rome. It is very spacious and could comfortably accommodate several people; however, it is also a nice size for a couple. The location was also perfect! The building is practically around the corner from St. Peter's Basilica and within a 10–15 minute walk from the other main Roman sites (Pantheon, Trevi Fountain, etc.) and the Trastevere neighborhood.
One thing to note is that the apartment is on the third floor of relatively steep stairs, so I would recommend a backpack versus a rolling suitcase.