In a former theatre, la Gaîté Lyrique in Paris is a digital arts and modern music center located in the center of Paris, in the 3rd arrondissement to be more exact.
Depending on the time of the year, you’ll find temporary exhibits there. You can also go and visit the resource center on the first floor which is usually filled with students or people working there (I’ve spent hours working there when I was a student, and I still do).
There’s a coffee corner if you wanna have a bite or a drink. And when the night comes, there are some live music events.
Do not hesitate to check the program and sign up for an event or just to go there during the day to have a tour and check out the place.
If you ever need a place to go and work during your trip in Paris, this one is the one to go for sure. It’s open every day and even on Sundays you can go there freely (you just need to order a drink) and it closes late enough.