Every print need different printing settings. There is no golden value :)
In most cases 0.4 mm is ok, if you need more details, you can decrease it to 0.3 mm. But in this print (and other vases) I recommend 0.5 mm for more durability, better quality and seal (I refer to the 0.4 mm nozzle). Thinner line width may cause layer delamination and leak.
If you printing it with PLA, set fan speed to 100%, and do not overdo it at speed.