Anton Balykov
Google
This was my second time staying at "46a | apart'hôtel". I really enjoyed it there. The rooms are clean and equipped with everything you need: a tea kettle, a Nespresso machine, cutlery, utensils, pans and pots. There is a fridge and a stove so cooking is easy (beleive me it is much cheaper to cook yourself than to go to the restaurant in Lausanne).
The hotel has their own gym and sauna, which is (together with the closeness to the lake) yet another advantage.
With all the above being said, I definitely recommend this hotel for your stay in Lausanne.