Take either the bus 98, 99 (AERO BUS) or the regular lines 52, 59, 70 to the city center and get off at "Albert I".
Note: Buses 98 and 99 directly enter both terminals, but they are more expensive (6 euro). The others leave just outside Terminal 1 (if you arrive at Terminal 2, you can take the free shuttle from Terminal 2 to Terminal 1) and cost 1.50 euro. At Albert I, follow the street for 100 metres, until you arrive at a big square, Place Massena. From there take the tram in direction "Henri Sappia".
Take the tram (the bus ticket is still valid), until the station "Libération". On the other side of the stop go back for around 150 metres, and the hotel is right there.
How to get there from the main train station (Gare SNCF):
Turn left and walk for around 200 metres until you find the tramway. Turn left and continue walking for 5 minutes. The hotel is right there. Alternatively, when seeing the tramway, you can also cross the tramlines take the tram in direction "Henri Sappia" until "Libération" (one station only). On the other side of the stop go back for around 150 metres, and the hotel is right there.
How to get from there to the venue:
Go back to the tram stop "Libération". Take the tram in direction "Henri Sappia" for two stations, until "Valrose Université". Get off there, turn right onto "Avenue Doyen Jean Lépine" and keep walking for 5 minutes, until you enter the campus of the university. Follow the signs of the building "Dieudonné I" (next to Biochimie). The conference will take place in the ground floor, in "Salle de conférence".