There was an issue with the initial room, which should not have been let out in its condition, to wit: mould on the wall due to water infiltration, which also made the room abnormally and uncomfortably humid. In addition, improper bathroom plumbing installation means that sewer smells came into the room from the bathroom drains. As others described, the room is very small, which would normally have been fine, but which made the noted issues that much more noticeable. Other issues are that you will hear all comings and goings in the hallway and bathroom use in other rooms.
I was moved to another room only late in the day on the second day of my stay (that room was fine) with no response from the host immediately after checkin and after hotel staff indicated they could not handle the issue themselves (although were sympathetic).