My daughter and I stayed four nights at Mathias place. We liked it a lot. It is cozy, small, and is a great location if you appreciate a more quiet area and are willing to walk 15-20 mins to center of town or take the metro or Strassebahn. Everything we needed was a couple of blocks away: supermarket, coffee shop, restaurants, pharmacy, public transport, etc.
Mathias was a very attentive host. He gave us good tips every time we had a question and he he always responded soon after we’d texted him.
The bed is like a bunkbed without the bed below, so you have to climb the stairs up. The bed-sofa is big enough and comfy to sleep too, even without making it a bed. We slept there and were comfortable.
I would come back to Mathias place in the future for sure.