@Baron1 Both hosts and guests are welcome to post on these forums. It's actually helpful for hosts to read guests' points of view and questions and vice-versa.
I can't imagine why any host would have problem with you bringing your computer chair. (Although if the guest space was up a flight of stairs, that could pose a problem for you, to carry it up, so you'd want to check that out, as well) Like Susan said, just communicate with the host before booking to make sure there isn't any reason why that wouldn't be alright and to give them an opportunity to rearrange things if necessary to make space for it.
It's also a good idea for guests who spend a lot of time online to make sure that won't be an problem, either. High speed, unlimited internet isn't a given everywhere. Some hosts are used to guests spending an average amount of time online, and budget for that, but if they are paying for a certain amount of GBs per month which is normally adequate and you end up using 3 times that much, it could be an unforeseen issue.