My husband and I stayed at Frederica's place for 5 nights. The only great thing about this place is Frederica herself. She was very welcoming and accommodating. Our flight was badly delayed and she met us outside the apartment in the middle of the night.
As to the apartment itself, it is very small and very, very basic. On the surface it looks clean but there is a problem with insects which we reported to Frederica. The bed is very high up, so it is really hot to sleep there in summer. Lyon can get very hot in summer. Fans don't make much of a difference.
We felt that this place is probably OK for some young backpackers but any older couple like us should consider paying just a bit more and staying in a more comfortable place in a better part of the city.
At the end of the day you get what you pay for, so we should not really complain.