I used it on my honeymoon. The bikes were fine, so cheap as to be nearly free, the app worked well, and riding in Paris was fun.*

You don't absolutely need a European credit card because you can buy a membership online or in the app instead of at the kiosk. However, it is absolutely necessary to have your smart phone running the app, to find bikes or empty spaces. There's a daily flow of bikes from hotel areas to tourist areas and back, and if you set off for the Arc or the Tower or the Louvre at lunch time you'll need the app to find a station with a bike near your hotel or a station with a free spot on the Rue de Rivoli.

On thing I got but I had to explain to my wife, it's not an all-day rental, it's a share. You don't park the bike at the cafe, you put it in the station and get another one when you leave. If you come up on the 30 minute limit you swap bikes. People tend to get bikes at the top of hills and ride them down, then not return, so there's feature of the system that if you ride a bike significantly uphill, you get credit.




* I had fun, my wife was terrified and hated it