Hotel WindsorvsHotel Guynemer
Hotel Windsor and Hotel Guynemer are both praised by experts. On balance, Hotel Guynemer is preferred by most reviewers compared to Hotel Windsor. Hotel Guynemer comes in at #6 in Casablanca with endorsements from 3 sources including Frommer's, Lonely Planet and 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 Guynemer
 Rough Guide
 Frommer's
 Lonely Planet
2 Rue Mohamed Belloul, Casa-Anfa, Casablanca 20000, Morocco
From $0/night
- Free Internet
 - Room Service
 - Laundry Service
 - Concierge
 - Restaurant
 - Kitchenette
 
 Star
 "A fairly well-appointed, family-run hotel just off Rue Prince Moulay Abdellah and Av Idriss Lahrizi in the most architecturally interesting part of town." 
 "This Art Deco, family-run hotel is a traveler's favorite and beats all others hands down for friendly and helpful staff." Full review
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You'll need to book your stay ahead of time, and you can also request an airport pickup.
 "Regular rooms are comfortable but slightly cramped (especially the bathrooms); suite rooms are well-sized." Full review