I stayed at the Ausonia for a few days in mid April, 2024.
I arrived by train and it was a quiet and easy walk from the station through a pleasant path, although slightly marred by the path taking a tunnel under the railway line, where drug addicts were taking drugs in an area just off to one side, making it seem potentially dangerous after dark (I left in the dark, so actually walked further along a main road to avoid this subway).
The hotel is in a quiet road off this park, which leads directly to the main seafront road in Rimini, so it's well positioned for the beach and restaurants, without the noise of passing traffic (to be fair Rimini was very quiet in general the few days I was there).
The hotel generally is well kept, but my tiny single room was very sparse and I would pay extra for a double if I visited again. To be fair though, the room was always clean, the shower hot and decently powerful and the bed comfortable enough.
Sadly, on the Saturday night there was a very noisy group of people who seemed to spend a good few hours banging loudly on each others' doors and holding loud conversations in the hall - This rather spoilt my overall impression of my stay, if I'm honest, although that's the luck of the draw, most of the rest of the time, the hotel was quiet.
The reception staff were always friendly and helpful (luckily at least one spoke English too, which helped me as my Italian is, sadly, woeful).
Overall, for the money the Ausonia was good.