Hello! Thanks for the addition. I looks great to me. Whenever I'm curious about tag usage I use the tagInfo site to see what other folks are using. Here's the tag values for "leisure" https://taginfo.openstreetmap.org/keys/leisure#values. If you search for hackerspace you'll see ~1400 uses which seems great.

I also find this site helpful (https://projets.pavie.info/yohours) as opening_hours can be a headache to get right. The ones you have look great. 

Happy mapping and welcome!