Marco's place was great size for a group of six and had more than enough space for us all to be comfortable. Marco himself was also very responsive and even left us a booklet of instructions and tips/recommendations on what to do and where to go. You can tell he's an experienced host.
The location is right next to the Termini train station so traveling to other places was easy as well. The balcony was big enough for a small group to relax on also.
If you're going to Rome with a few friends or family then this is a great spot to choose! I definitely can't wait to go back!