I stayed in this flat for a month on business travel. I would return to this flat and recommend to anyone staying in Lausanne for an extended period or short stay!
The hosts provided clear instructions, and check-in was seamless. Upon arrival, I was impressed with the cleanliness and amenities. However, I was expecting the washer to be in the unit, but it is a shared appliance in the basement. This was not an issue though, as the building was very well maintained.
The location is great; Simplon 10 is steps away from the train station, a 10 min walk to the lake, and has a beautiful surrounding neighborhood. I felt very safe as a solo female. Good value for money in an expensive city.