Harmless spider-like creatures with eight exceptionally long, thin legs. They do not spin webs but occasionally wander into homes.
Household insecticide products labelled for crawling insects will solve the problem.
For persistent problems with Harvestmen Spiders, we would recommend you contact professional pest control company, preferably a member of the IPCA to administer treatment. A trained professional will have the technical knowledge and access to a range of professional use products and equipment which are not available to the public.
Use a trained professional pest controller.