We stayed at Franziska's apartment for 5 nights. Apartment is a gem! It's stylishly decorated and clean, has really comfortable beds and air conditioning in every room.
Location is excellent, few blocks between Tiber river and Trastevere main restaurant area, so it's close to where you want to be but in really quiet side street.
Franziska is really great host. Communication was fast, our check in and check out was easy and flexible with timing. We got helpful tips for moving and restaurants etc.
I can strongly recommend this and would definitely stay again!