Sorry this happened to you. Furious is a strong emotion. If you start out this way, it won't be good for you or the host. I would try to contact the host again. Ask for their help and explain your need. Be understanding. They may not be able to accommodate an early check-in, as they may have other guests leaving the same day. If you won't have early access, consider adjusting your arrival time by taking in some of the city sights or relaxing on that couch in the lobby. Just as you accidently submitted a booking Request instead of an Inquiry, the host may have accidently Accepted, while thinking they were giving you a Pre-Approval. In any case, try to let go of the negative feelings you have. Enjoy your trip!