This place is a good option to stay while you are looking for a permanent place to stay in Lausanne, and why not shorter stays as well. We stayed for around 4.5 weeks here in total. The building was overall pretty calm & quiet, but there were a couple of evenings when neighbors threw loud parties outside the quiet hours (7-22).
There's parking available and the location is just 5-10 minutes from the city center, which is great!
When we arrived, the apartment was clean and equipped everything we needed. We noticed later that it says "weekly cleaning" on the OK Logements website, but that didn't probably apply to our case. We also received only 3 coffee capsules for a 4 week stay, even though it said "coffee" in the description. Maybe that meant just the coffee machine.
The air quality wasn't that great, you could sometimes smell a damp smell or of smoking. There was a big window that helped with air circulation, though.
Overall we had a pleasant stay, thank you!:)