I'll start with the short version: avoid this accommodation at all costs, especially if you plan to stay more than one night in Agrigento.
The good price is tempting, but it comes at other costs. For one, the location provided on AirBnb after booking is not the correct one for some reason. This, combined most likely with a language barrier between you and the host (unless you speak Italian) can lead to some confusion. We were fortunate enough to resolve it quickly, but judging by other reviews, others were not.
Once you arrive at the house though, you'll see that it's mainly unaccessible if you don't have a car. You drive onto the premises straight off the main road and there are no sidewalks around. Also, given the somewhat complex road infrastructure in Agrigento, it's certainly not one minute away from the city center as advertised.
The garden is indeed beautiful as advertised, and the check in went smoothly. We were provided with the basic information you would get at this point (wifi password, a list of restaurants, etc.) as well as some treats in the kitchen. However, once you look around a bit you can easily tell that almost no effort was made to clean the place. Spiderwebs hang in most corners, most of them with spiders attached. The issue escalates when you start finding a variety of different pests. Overall we found a giant myriapod, a huge cockroach (hiding behind a bed cushion) and 2 species of spiders, not to mention the ridiculous amount of dirt under the bed.
So, to conclude, unless the host starts taking her guests more seriously and also provides more accurate information, I'll stick to what I said initially and don't recommend staying here.