After reading assorted reviews I would not have chosen to stay at this hotel, but the tour I was joining picked it. It was, alas, as bad as I had feared. The public rooms are lovely, you should stop by and take a look, but DON’T plan to spend the night.
If you do have to stay, try to insist on a room on a high floor - the noise from the night club is really bad - pounding bass. Also, you WILL get bitten. I didn’t quite believe the reports of biting insects (which I encountered nowhere else in Morocco), but after I woke up with itchy bites I quickly became a believer. I dug my silk sleep sack out of my luggage, and that defeated them.
The front desk staff try to work a scam on solo tour group travelers. When I checked in in the morning, they took forever to find the tour paperwork, and then chose to put me in a single room. When I came back to the hotel for the evening group meeting I found a notice telling me I needed to move into a double room with my assigned roommate. Turned out I could stay in the single room they had assigned me - provided I paid 290 dirhams! I heard later that this is a common practice.
The single room was small and dingy. The French windows to the balcony didn’t open. The shower would have gotten the toilet wet. The room had no toilet paper, and getting some turned into a major exercise . The first double room had lights, but you couldn’t turn them on from the door. The second double was actually a suite, but there were no lights, working or otherwise, in the second room. The bathroom with this room did have plenty of hot water.
Breakfast was disappointing - watered orange juice, so-so coffee and pre-packaged cheese.
If you do stay here you will probably have to be able to give your taxi driver directions. If you come by train, IGNORE the taxi touts and the taxis just outside the station - walk out to the main street.
Casablanca seems to have serious shortage of reasonable hotels, and of worthwhile tourist sights. I would recommend staying in Rabat, where the hotel situation is somewhat better, and day-tripping to Casa. There are frequent, comfortable, trains from Rabat Ville station (currently being renovated, but still navigable) and Casa Port.