The stay at Ariana's place was perfect in every way imaginable. Ariana herself was super nice, explained everything to us and even gave us some pastries because one of us had our birthday. The flat itself was clean, comfy and had everything we needed, including a kitchen. From the flat, the walk to most of the attractions (e.g. the Vatican, the Colosseo, the Foro, the Trevi Fountain, the Pantheon and many places more) is at most 30 minutes, or even less.
Overall I can say that our next stay in Rome will surely be here again!