Lorenzo is great and his place is really 5-star awesome. I'll give some detail.
The apartment is recently renovated, sparkling clean, in a great location close to Termini station, nearby grocery stores and restaurants, and short cab rides from most of Rome's most famous sites (on the way back I told taxi drivers that it's next to the Hotel Repubblica). If offers 2 comfortable beds, a sofa bed (not as comfortable as a real bed), in 2 European-sized rooms and two wonderful and updated bathrooms (perhaps the best feature of the apartment). There is also a kitchen with a fridge and a microwave but that is reasonable and not great. There are plenty of airconditioners that work really well to chill the place. The TVs are connected to Netflix and he has great WiFi coverage and a fast Internet connection. The place is bright and modern, with quality windows that keep the noise of Rome out and curtains and louvres that can be closed to keep the sun out. There is enough seating (if you sit on the sofa bed) and there are enough dishes and silverware for a number of days in Rome. I don't know about laundry facilities.
The apartment is on the 4th floor with a quaint elevator that needs people to manually close both doors behind them when they leave. If they forget to close them, the elevator does not work. In that case, you have to climb up! For us, we had to climb up once a day.
Lorenzo communicates right after the reservation and then very promptly afterwards if you ping him for anything. We did because my wife wanted a hair dryer which he got. Also, he speaks reasonable English. The key exchange went really smoothly and we didn't have to wait. He offered and connected us to a car service that brought us from Rome airport to the apartment. The driver let him know that we were on our way. That also worked really well.
I really think you will like his place.