• Gästehaus der HTWG Konstanz is perfect for a long stay during the study weeks. You can contact  Frau Petra Ballance, gaestehaus(at)htwg-konstanz.de 
• Hotel Petershof - ca. 3 minutes walking distance
• Boardinghouse - ca. 10 minutes walking distance
• IBIS Hotel Konstanz - nearly on the other side of our building
• http://www.bilgereck.de/  -searly on the other side of our building
• http://www.abc-hotel.de/ -  ca. 10 minutes walking distance
• http://www.apartment-hotel-konstanz.de/ - ca. 10 walking distance
• http://www.bodenseefewo-konstanz.de/startseite.html 
• http://www.konstanz-ferienwohnung.de/ there are two options in this website, both of them are about 2 km away 
• http://www.fewo-konstanz.de/: These places are also walking distance
• Fereinwohnung Wilfried Bühler, Winkelstrasse 6, 78467 Konstanz, Tel.: 07531-75394, wilfried-buehler(at)t-online.de

Because Constance is a favourite place, it is possible that those options are already full booked. Following are couple of other options you might consider

• Kreuzlingen (CH), directly at the Constance border. Some hotels there are even closer to our place as the ones in Constance
• Just like Constance, Allensbach and Radolfzell are also located in Bodensee. The public transport Seehas (S-bahn) goes regularly to Constance. It takes about 10-15 minutes from Allensbach and about 20 minutes from Radolfzell