Before our arrival I completed the required online profile and was told that the day of the arrival I will receive a link to open the doors with a unique code. I reached out to the host and asked if there was any alternative because I did not have an international data plan and I was only using local wifi as needed, so I did not have a way of accessing their link. Their response was that the door could only be opened with the link or if I gave them a call so they could open it remotely for me - again, I did not have an international data plan so calling them was also not an option. So we ended up having to pay for a day of international data just to get a door code.

The morning of our arrival we still did not receive the email with the link, so I had to message them again to request it. But meanwhile I got 3 messages from them promoting a taxi company.
Their instructions were not very clear and they did not list the apartment number (just the building number), so we weren't even sure we were at the correct door.
In the apartment there was no information about accessing the WiFi, so again we had to reach out to them to get that information (every other place I've stayed at had the WiFi information either in one of the welcome messages sent 2-3 days before arrival or on a paper in the apartment).
In the apartment we found a set of 2 keys: one for the front gates and one supposedly for the apartment door, but it did not fit at all. Again I had to message them to ask how to lock the apartment door. I even sent pictures of the key that looked nothing like the door lock. I got no response so I called them and their response over the phone was that they will send somebody to check the door key, but they have hundreds of properties all over the town, so they cannot tell us exactly when the maintenance person will arrive and they will just call us. This was not an acceptable answer from a property management company! So I called Airbnb to escalate the issue because we were stuck in an apartment we could not lock to go and get some food, or go sightseeing. I did not pay an overpriced rental price to stay inside an apartment all afternoon waiting for a maintenance person.
While I was on the call with Airbnb, they send us a message with a code that was supposed to work both for locking and unlocking the apartment door. We tested it and it worked. Why could we not have received that same code the day before our arrival so we did not have to pay extra for international data and have to message and call both the host and Airbnb just to be able to lock the door?
Many places now use self-check in and I have never had issues before. But every other place provided the code ahead of time and did not require any internet connection to open the door.
The communication and customer service was all around very poor both before our arrival and dealing with the lock issue.