First of all, you'll book this place for its location - for sure. You have a fantastic view over Largo di Torre Argentina where - according to a legend - Caeser was murdered by numerous dagger stabs, and now numerous cats live! Nonetheless, we arrived by car which is a horrible idea if you'll ever visit Rome but we did it anyways. You have to know that there is no parking, not nearby nor anywhere close to the centre. There are areas called "ZTL-Zones" which means "Zona a Traffico Limitato" (zone with limited traffic). It's forbidden to enter these areas during specific hours (mo-fr 6.30am to 6pm, sa 2pm to 6pm). If you do, there are horrific fees. Of course, we arrived AFTER 6pm! :) Btw after that, we took our car to a public underground garage called "Garage Porta Portese" at Via Francesco Benaglia, 22. Nice Ukrainian fella and good pricing. You want to do that if you like undamaged cars!
When we arrived, we parked 5-10min in the nearby street Via Paganica to unload. Our co-host Alessandro greeted me friendly and introduced me to the apartment: It's located on the 6th floor. There's this very authentic elevator which you'll be introduced to, too, just be aware of the red light not blinking anymore. The apartment itself is offering decent space and an AC but just in the bedroom (the other rooms can get quite hot, even though we closed all the shutters and windows during the day). I'd describe the place as "vintage" and if you'd have a closer look on the paintings, they would tell you stories about Rome. The kitchen is basically equipped, other people wrote about the cleanliness of this place and again, I'd describe it as "vintage".
We stayed for 3 nights and it was totally fine. Sure, it's not the most modern place but that's basically what you get when you want to visit Rome a bit more authentically.
Btw we took a private bike tour through "free bike tours Rome" (freebiketoursrome dot com) and the meeting point was right infront of our apartment. Our guide Simone took us through all the hidden places and told us stories about Roman architecture, history, and politics. I'd really recommend to get in contact with them and enjoy a nice bike ride through Rome.