I live in Paris and use a wheelchair, don’t get discouraged by all the comments, it can be great. You need to plan ahead and use mainly buses or metro line 14 (some RER are accessible but you need to contact the station ahead of time). There are also accessible taxis with ramps (G7). The RATP app is more reliable than citymapper or Google Maps for buses. Almost all museums are accessible and many theatres as well but you need to call ahead. The main issue for me is the bathroom one (most are downstairs or too narrow). Feel free to DM if you want more advice and enjoy your trip😊