Lyon offers many hotel choices at reasonable rates. The following gives you areas where you may wish to book a hotel and have convenient public transit in IN2P3.
Metro A Vaulx en velin- Charpennes + Tram T4
25 Montee Saint-Sebastien, 69001 Lyon
Quai Claude Bernard Tram T1
31 Rue Chevreul, 69007 Lyon
Quartier de la Guillotiere Tram T1 Saint andre:
30 Cours Gambetta, 69007 Lyon
Quartier Part dieu Tram TI vivier merle
79 Boulevard Marius Vivier Merle, 69003 Lyon
Quartier Gare Perrache Tram T1
12 Rue Marc-Antoine Petit, 69002 Lyon
Frankly, any are near the A line stop or a T1 stop is suitable. The A line will take you to Charpennes where you transfer to the T1 tram. Alternatively, booking a hotel near a T1 stop allows you to go non-stop to the meeting. There are also a couple of hotels that are within walkable distance. Simply use Google to map out you options.