We had a great time at Franziska's place. The location is great -- easily walkable to the centre of Trastevere and also easily walkable into the centre of Rome itself -- but is also a nice quiet spot to relax after a day in the city. We really appreciated the bottle of wine waiting for us after a long day's travel too!
The apartment is compact but very clean and comfortable and has everything you might need, and the bedrooms are great too. Franziska was responsive to all questions we had, and also helped us organise transport to the airport on our way out, which meant we could enjoy our last day in Rome to the fullest. We would highly recommend this place if you're hoping to visit Rome!