I would recommend Manou’s place for one person without any hesitation. The studio is quite small,but has everything you need for a short stay.
The place is clean,newly renovated,has a great shower. It’s located very central close to the cathedral St. André and one can reach everything by foot. To the station St. Jean it’s about 30 min walk. Manou answers quickly to your concerns.
Careful if you are not into room perfumes, for my taste it was a little too intense.