You might be moving into my building, or one with a similar owner. Some landlords are like that. They prefer to know they won’t be renting to low-lifes, disappearing acts, a band, or trouble makers. These days, probably not tattoo artists. Some prefer to rent only to a family. Some just don’t care and want to fill the space. Some have a reputation in the community and don’t want to hear from a third-cousin about the noisy tenant. I deal with it by giving them what they ask for as long as it doesn’t involve private information. I wouldn’t give my ID before signing a contract, for example. But I’d answer almost any other question. You can always lie.
Some also act as property managers and have ongoing revenue from that, and themselves don’t want to deal with a freak. I’m picky about where I live, so I am willing to go through difficulty to get the apartment I want.
Most people won’t need to go this route, but if your on your own and in a hurry, there are a couple of informal services that will help you find an apartment. I posted looking for a place in some FB groups and was contacted by two. They contact the landlords for you as something like your personal assistant so there’s no initial ‘foreigner shock’ and work the situation out for you. I was told by one that they’d never had a landlord ask for a guarantor. I ended up not needing it, but I might have followed through if I hadn’t found a place.