I stayed at Mario's house for a day and it was quite satisfying. It's super close to the center and to the subway stop and the bus station is just walking distance.
The room is big and really quiet. It was quite warm.
It was fairly clean, only problem I had was touching the doorknobs because they were kinda greasy (I am a cleaning maniac, I am sure nobody else has noticed that) and the blanket I had wasn't super clean either.
Mario is very kind and thoughtful host, he gave us all the info we needed and we had the chance to meet him before we left.
Thanks Mario for being a great host :)
Best wishes