The apartment was tidy; as others have mentioned the bed was firm, however this is a personal preference and I'm used to a firm bed so it was fine for me!
I did have a major problem with the WiFi which rendered it basically useless, and as a foreigner who is absolutely reliant on an internet connection to communicate and make plans, it had a big impact.
My issue was that after a period of time I would become disassociated/disconnected from the WiFi network. If I attempted to reconnect immediately, I was prompted for the password to the network as the saved password wasn't working and attempting to re-enter it would fail. After waiting a minute or two I would be able to rejoin the network. As time went by, the disconnects became more frequent, to the point where I would get a minute of connectivity if I was lucky. (Sometimes it would take a few tries to get a message through to the host as I would be disconnected before I had a chance to finish the message!)
Powering the router off and on again would alleviate the issue, but didn't resolve it, and as before I would get disconnected more and more quickly as time passed since the reboot.
The host was sympathetic to my issue, however wasn't able to resolve it. Thankfully I was only staying a night. The host contacted the Internet company who said there wasn't an issue with the connection.
My professional opinion is that the issue was with the router/AP itself (and not the VDSL internet connection). Either a firmware or hardware issue; I note that the SSID was configured with WPA (TKIP) rather than the secure WPA2 (AES). I note also that I wasn't able to replicate the issue with any other network I connected to during my 36 hours in Taiwan. Finally, neither restarting my phone nor resetting its network settings helped.