I think my off the cuff answer is Trinity. Low key atmosphere and there’s a lot of room so you can either do your own thing (not bothering anyone) or, if you’re social, glom on to other conversations.

On slower nights, Ordinary is a good answer here. Bartenders are always great to chat with. However, this is a smaller bar that can get busy and I think a solo drinker might end up feeling like they’re taking up space.