Close to the city centre (15 min by public transport (Bus Line 2), 30 min walk to the institute):
Hotel am Schloss: http://www.hotelamschloss.de Hotel Hospiz: http://www.hotel-hospiz.de
Close to the institute:
Hotel Garni Sand: www.hotel-garni-sand.de Hotel Meteora: www.hotel-meteora.de Hotel Barbarina: http://www.hotel-barbarina.de/english/index.html
Complete list:
http://tuebingen-info.de/index.php?id=770
Google Maps Overview