pain in the ass, pain in the neck, annoyance, bother, botheration, pain, inconvenience, noyance, botherance, incommode, more...

asset, benefit, advantage, boon, perk

mosquitoes, flies, ants, cockroaches, weeds, noise, traffic, smells, more...

public, great, such, private, intolerable, common, damned, serious, real, general, minor

annoying person,   minor problem,   a bother,   an annoying person,   minor inconvenience,   bugs' bugbear,   bothersome thing,   little pest,   pesky cloud,   annoying matter