Marco's apartment is exactly as described in the pictures.
It is large, beautiful and extremely clean.
While he wasn't able to meet us personally, he did send a friend who met us within 5 minutes of our arrival to the apartment, even after we were close to 2 hours late due to a train delay we experienced. Marco's friend (sorry we didn't catch his name) was exactly the type of check in experience every AirBnB should have.
He took time to show us how everything worked in the apartment like the locks, windows, air conditioning, refrigerator, etc. This stood out to us because we spent a few weeks in Italy staying in several AirBnBs and each place had it's quirks, ESPECIALLY when it came to locking/unlocking doors and windows. He also was very hospitable and took 10 to 15 minutes to tell us about the local area and gave us recommendations to local restaurants and provided tips based on our itinerary.
Going back the apartment - The Wifi worked great - this was the first place in 3 weeks in Italy where the Wifi actually worked. However please be aware that upload speed in Italy appears to be so low that you cannot realistically do something like backing up your photos to a service like Google Photos.
The location is right in the middle of Trastevere - tons of restaurants and bars are literally around the corner but luckily the apartment is on a side street that doesn't have any businesses on it. You may have some people in the street outside the window but only until around midnight and they are not too loud - they seem to be people who are looking for a more quiet place away from the mobs of people 1 block away.
Marco was super gracious with us when we had to make a last minute modification to our original booking and was always available to be contacted via the AirBnB app.
Lastly, Marco helpfully has a local contact for transportation to the airport located on a flyer in the apartment. We reached out to this person the day before we needed to be at Fiumicino airport for pickup at 4AM. The prices are listed on the flyer and are only about 5 to 10 euro over the fixed city taxi fees to the airport and we were able to schedule a ride in a nice, clean Mercedes as opposed to the cramped dirty city cabs.
Trust me when I say that Marco's place is where you want to stay in Rome.