This apartment is just perfect. It's really classy-high ceilings and large windows, and there's a ton of space. We felt right at home! The location is also really perfect. It's about 2 blocks to the Neubaugasse metro station, and only 3 stops to the main square. It's very easy to stay at Lena's and explore the whole city!
We didn't get a chance to meet Lena, but her mom met us at the apartment to give us the keys and show us around, and she was very helpful (as was Lena communicating via email). Highly recommend!