My parents stayed at Numa Belfort so this review is from them:
We stayed in a deluxe suite with balcony at Numa Belfort and it exceeded our expectations. A very impressive accommodation, nicely done with very good taste, a lot of light, nice and warm for some cold winters days (!), a beautiful building with an impressive and luxurious entrance and very good immediate service via whatsapp. We did not try the breakfast selection but it looked nice in the cute cafe on the ground floor. We loved our room on the 3rd floor in particular with ample light and bright windows and a great view! We will definitely be staying here again. Thank you for our time here.