Casa Antigua's courtyard and rooms are lovely. It might be a bit expensive compared to other hotels in the area, but the service, rooms and breakfast quality is definitely superior. We were unlucky enough to stay in the rooms at the back where during the weekends it is impossible to sleep because of the loud noise coming from the disco-bar right next to it. At the reception, they told us they were trying to do something about it. Besides that annoying detail, the stay was perfect. Breakfast (buffet) is not included in the price, but I highly recommend it!! I also recommend to enjoy a beer in one of their beautiful terraces. Bonus: the store right next to the hotel has high-quality local products (direct access from the hotel's courtyard).
We stayed in 4 different hotels in Antigua during our trip (some belonging to the same owner) and this was undoubtedly the best choice.