Paris Hotel Selection

Trying to make a decision between Le Belmont and Mercure for 5 nights in June - Anniversary # 25.. Any feedback on these hotels and locations appreciated. Not sure Le Belmont on Rue de Bassano is walkable to the Eiffel Tower, Orsay, Louvre, Notre Dame... Thanks for any help. Only been to Paris once and stayed near Eiffel Tower at the Hilton which is not offered in packages available to my travel agent. Loved the location. Thank you.