Response from Serena:
Hey Aldebaràn, I thought we had talked about it and I also thought I'd been clear but obviously not enough.
Basically, the day of your leaving all I said was that I would have been happier if you left the house with me at 9 p.m. so that I could lock the door to spend the night out peacefully knowing none was home.
I thought it could work well for both of us as you had to leave the very same night with the 23.00 train.
The bad experience I had before (and I don't even know why I talked you about) had nothing to do with you and definitely I did not wanted you to pay for it.
Hoping it is finally clear!