This flat is great! It's really spacious feeling, airy and clean. There were three of us, which is probably about the right number for the size of place as it's got 2 bedrooms- one with a mezzanine- so more people and we'd have been into sofas and sating etc. That said, if you don't mind that then 5 could happily stay there! It's an amazing location. No more than half an hour walk anywhere and it's only 10minutes to trastevere (bars, restaurants, life) and the same to testaccio (quieter but some great places to eat- try da felice!) and the Colloseum and Forum.
Even in mid January we still went up to the roof terrace every morning for coffee and views of Rome. Not bad!And we had literally no problems or issues whatsoever with the flat or with arrivals, check outs etc. Giuseppe was really welcoming and give us some good tips too- thanks man! You may have guessed that I would recommend this place.