My wife and I (50's), decided to go to Germany for a quick getaway for the Christmas markets. We've been to Freiburg several times but usually stay at a hotel or with friends. Luckily we found Sabine's VRBO. It was perfect. She had just about anything you could need stocked at the apartment. Beds were very comfortable, unit was warm and easily adjusted if uncomfortable. It was so quiet in the unit that on the second night, we played "fan running" on my phone on low volume! Sabine was very communicative and answered any questions we had both before and during our stay, but didn't hover, like some hosts do.
Unit is very convenient from the main train station. Just a short eight minutes tram ride to the HBF and a couple minutes more to center of city. My wife and I are runners and ran every morning we stayed there. We ran around the SeePark several times, but the best run was just a short , less than a half mile run in the direction that tram runs, bringing you to the apartment, to the river and there is a trail that runs along the river that seems to go on forever. We ran about five miles on it and it kept going, BEAUTIFUL!
If you're planning a trip to Freiburg, definitely plan on staying at Sabine's if there is availability. You won't be disappointed!