Agrigento is a very touristy place, largely due to it's small and quaint mountainous downtown area and its proximity to the amazing greek ruins of Agrikos. As such, the accommodation there is overpriced, even in the off season. If you're renting a car, you might be better suited to staying out of old city center, as there really isn't that much to see there and it's expensive; see the ruins and move on. Casa Ravanusella is located in this city center area, staffed by the same friendly registration office as a few other nearby B&Bs. Parking is tricky, and your proximity to the registration building will determine whether you get WiFi service or not, we did not. The rooms were clean and adequate, although ours faced out onto the major street circumventing the city center and it was very loud in the morning. Would have rather them knock €5 off the price than have the breakfast, but what can you do?
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