Near Hotel Maastricht and in the city center (Wyck) is fine, casual Italian restaurant run by a Sardinian family. They offer excellent (real, thin) pizzas; a good choice of appetizers, pastas, main courses, and desserts; and a fine wine list. There is friendly service and a friendly atmosphere.
Now, if only smoking was forbidden here (or at least separated), it would be a real perfect, simple, enjoyable place...