I guess you have to work out what you want:
Do you want to stay and have the issues resolved (no host on the couch, more toilet paper, faster internet) or do you want to be refunded so you can go elsewhere?
If the listing didn't say that the host lived there as well and that the couch was common space, you have very good grounds to get refunded. But if that was clear from the get-go, I can't see how that is a surprise or a problem. The host will not cancel as she will not get money, in fact she will get a fine instead. So that will never happen. Some hsots only provide a couple of rolls for a stay, then guests will need to get their own. This should be discussed prior to starting such a long reservation so the boundaries are clear.
I don't think it was bedbugs, they don't go away that easily. You would be plagued with it still. Did she promise ''internet'' or ''high speed internet''? There is no limit to the speed, so that is no cause for a refund.