Hotel WindsorvsHotel Transatlantique
Both Hotel Windsor and Hotel Transatlantique are highly recommended by those who travel for a living. On balance, Hotel Transatlantique is preferred by most reviewers compared to Hotel Windsor. Hotel Transatlantique is ranked #15 in Casablanca with positive reviews from 2 reviews such as Lonely Planet, Rough Guide.
Hotel Windsor
 Rough Guide
93, place Oued Makhazine, Casablanca 20070, Morocco
From $0/night
 Star
 "A good-value hotel with large rooms with either a large bathroom or (cheaper) just a shower. There’s also a decent bar." 
Hotel Transatlantique
 Rough Guide
 Lonely Planet
79, rue Chaouia (ex Colbert), Casablanca 2000, Morocco
From $54/night
- Bar/Lounge
 - Free Internet
 - Room Service
 - Free Breakfast
 - Shuttle Bus
 - Laundry Service
 
 Star
 "Founded in 1922 in a Lyautey colonial building, and recently refurbished with a great mix of colonial decor." 
 "Set in one of Casa’s architectural gems, the decor at this 1922 hotel is all a bit over the top." 
 i 
Avoid the 1st floor, as it gets the brunt of noise from the popular and very rowdy piano bar and nightclub.