The place is as advertised. The private area is bound to have a parking. However, I won't recommend this place if it's not because of the need of parking. This is not the fault of the host, but rather the nature of Firenze (aka Florence). If you do not have a car, I think you can get more value by staying inside Florence city. Otherwise, your car would likely be mostly parked within the apartment private compound and never used due to the many ZTL zones and lack of parking in Florence. As a result, you're back to public transport or private taxis.
As for the apartment, it requires going up 1 flight of steps. It's as advertised and it's an awesome place. It would have an almost perfect score if not for the following challenges:
1. If you're claustrophobic, the shower is not ideal. Once you draw close the shower curtains, the tub is really tiny. And you may feel physically trapped as the curtains wrap on your wet body.
2. Just like a lot of Italian apartments, the hot water system resides in each apartment. It will often starts up and rumbles with a significant noise. If you're a light sleeper, ear plugs should easily solve this should you were the unlucky one that sleeps near the kitchen wall.

3. There are no dishwashers and no kettles.