I have recently registered my apartment mostly successful!
I paid a local lawyer in Fuengirola to help me register my apartment. I phsycially went to the town hall with my deeds, passport and NIE which was on my deeds luckily. They took copies and said it was all ok.
Then my lawer sent me the file by email with the registration number and i got Airbnb to help me relist my apartment.
Now i have purchased the medical kit, information pack etc.
Now i am also asking Airbnb to help me register each guest with local policia as this is a separate process. I guess they will eventually do a routine check up, i only just registered in September 2018 so hopefully no fine.
The lawyer company is ADH Aseoria, Fuengirola and can help you do it all remotely i think! Cost €150 and can also file taxes for €20 per month.