Hannah's apartment is very close to Mariahilferstrasse, U-bahn and Bus halte are also close by.
Hanna is very helpful, she tries to help you as she can for your sightseeing plan. She even wait to 21:00 for I can get my bag from her work which I left there the whole day as I've checked out in the morning and did the sightseeing.
I recommend Hannah's apartment for your stay in Vienna!