Take bus number 14 with destination "Gerbrunn" at the bus stop "Mainfranken Theater".It's about 5-10 minutes walk from your hotel, you can see it in the map below. The bus leaves at 8:13 am and arrives at 8:24 am at the bus stop "Mathematisches Institut" (9th stop) where you need to get off. From there, follow the signs. The buses run about every 20 minutes.

Take bus number 14 with destination "Gerbrunn" at the bus stop "Barbarossaplatz". It's about 2-5 minutes walk from your hotel, you can see it in the map below. The bus leaves at 8:12 am and arrives at 8:24 am at the bus stop "Mathematisches Institut" (10th stop) where you need to get off. From there, follow the signs. The buses run about every 20 minutes. On the way back from the University to your hotel you have to get off at "Stift Haug" instead of "Barbarossaplatz" since Barbarossaplatz is located in a one-way street.

Take bus number 13 with destination "Busbahnhof" at the bus stop "Kulturspeicher". It's about 2 minutes walk from your hotel, you can see it in the map below. The bus leaves at 7:56 am and arrives at Busbahnhof at 8:02. From there take the bust number 14 with destination "Gerbrunn" which leaves at 8:09 and arrives at 8:24 am at the bus stop "Mathematisches Institut" (11th stop) where you need to get off. From there, follow the signs. The buses run about every 20 minutes.