Loyse's place was great for my quick trip to Lausanne. It's very easy to walk to from the metro - just 10 minutes or so, and I had no problems finding it and checking in. I didn't meet Loyse in person, but they provided super clear instructions and were always very responsive to my messages, even accommodating me with an earlier check-in.
The only downsides for me were smells of smoke coming from neighbours through the windows, and noise very late into the night (well past 2am) from a nearby bar – which happened to be having a drag queen show outside the night I was there (quite entertaining actually, I stayed to watch a bit 😂). Both of these could be mitigated with closing the windows, but it was hot and I needed the airflow.