Suku Mai Dikko was choice
Yuru Camp and Flying Witch are both wonderful.
K-ON! The last few episodes of the second season broke my heart. Reading the manga made it even worse.
Also I'm not sure if Asobi Asobase fits in here but it's probably one of the funniest shows I've ever seen.
Aria the Animation and Yokohama Kaidashi Kikou are nice. Very relaxing.
Shoujo Shuumatsu Ryokou if you want to be hit with existential feels>>553
Seconding Yuru camp, it was maximum comfy