Hotel rated as 3 stars in Paris usually are usually well-appointed. Good ones are tastefully decorated and have amenities like wi-fi, modern facilities, and quality services. However, on your tour to Paris, don't be surprised if the room size is small, regardless of star rating. Also, location has very little or nothing to do with the star rating. Most 3 star hotels in Paris I have stayed in do not have restaurants. See my blog post for my recommendations for the best 3 star hotels in Paris.