I stayed at the Hotel Allegro Agadir recently and would rate it as a solid 3-star experience.
The Best Part: Location
The location is the absolute highlight! It is extremely central, making it incredibly easy to walk to the Agadir Corniche and the beach in just a few minutes. You are surrounded by plenty of cafes, restaurants, and shops, so you never feel isolated. If you want to be in the heart of the action, this is the place to stay. The check in process was long. Trying to get a towel after a long day in the sun was also a task.
As for the hotel itself, I found it to be quite average. The rooms are a bit dated and could use some modernisation, and the service was hit-or-miss, sometimes friendly, sometimes a bit slow. The breakfast buffet was decent but lacked variety if you stay for more than a couple of days.