A good site to use is www.parishotels.com you can select your price range and your area.
The two areas that I feel mean you have lots to do on your doorstep in the evenings are the Marais/Bastille & St Germain/Latin Quarter.
Hotel De La Place Des Vosges 12 Rue Birague Tel 42726046 Recommended located in a good area in the Marais €€
Hotel Des Grandes Ecoles 75 Rue de Cardinal Lemoine Tel 43267923 Left Bank area and recommended €€
Hotel Beaumarchais 3 Rue Oberkampf Tel 53368686 Close to thethe Bastille very smart, modern ,and helpful staff €€
Superb Moroccan Restaurant - 404, 60 Rue des Gravilliers 75003 Paris Tel 42745781
Le Souk 1 Rue Keller 11th Aronidissment Metro Ledru Rollin this is another brilliant Moroccan restaurant you need to book Tel 49290508 €€
Fish 69 Rue de Seine 6th Arondissment Metro Odeon excellent wine bar & fish restaurant with a prix fixe lunch recommended €€
Flo Restaurants this group owns some of the most wonderful brasseries in Paris. They all have good value set menus and are some of the oldest traditional restaurants in Paris now part of a chain but the settings are superb the food excellent and the experience of eating in such amazing surroundings with excellent food they include
Bofinger Rue de Bastille
La Coupole 102 Boulevard de Monparnasse
Julien 16 Rue de Faubourg St Denis
Chartier it’s a Paris Institution 7 Rue Faubourg Montmatre worth a visit for lunch or dinner
Orestias Left Bank bargain cheap Greek restaurant with set lunch packed with locals and visitors Rue Gregoire de Tours (6e)
Hugo, Rue Papillon 9th Arondissement Nr Gare du Nord between Rue Lafayette & Rue Bleue Tel 44830163
Nouveau Village Chez Momo, Morroccan 5th Arondissment Saint Michel 9 Rue Xavier Tel 43297592
Le Timbre 6th Arondissement St Germain 3 Rue Sainte Beuve Tel 45491040
Fabulous Area for bars, cafes and restaurants Rue de Charonne (Bastille) one in particular Café Pause won the best café in Paris award good French Bistro cooking. Also Rue de Lappe & Rue Faubourg St Antoine nearby are both full of bars
In the same area is a lovely walk along Viaduct de Plantes above Avenue Daumesnil with excellent “Artisan” shops below and Viaduct Café at No 43 is very smart and has good food
Musee d’Orsay If you can only visit one art gallery make it the Musee d’Orsay what the French can do with an old railway station fill it with some of the best impressionist pictures under one roof
Bateau Mouche Take a trip up the Seine rest the feet and see the bits of Paris you have missed
Pompidou Centre/ Beaubourg Go to the café/restaurant on the roof and for a fantastic view
Rue Mouffetard Left Bank a great food street market the real part of Paris and a chance to explore the Left Bank
Le Marais Lovely area to walk around some of the most trendy bars and restaurants Rue Vieux de Temples great street to walk down Bar Au Petit Fer a Cheval original zinc bar with excellent food
Canal San Martin is lovely local area with lots of good bars and restaurants start at Metro Jaures and walk to Metros Jacques Bonsergent or further to Republique
Shoe Shopping Rue Mesclay off Place de La Republique and Parallel to Bvld St Martin dozens of shops with fabulous choices & styles cheaper than same shoes in other shops in Paris