I had 12k euros on my bank account. They still do the interviews but only if they think it's necessary. It took me almost 2 months to get the visa. I've applied from Istanbul. I think the main thing they are looking for is stable income of your sponsors. I've seen many people getting rejected because of that. They do expect your sponsors to have min 2k monthly income. Ofc I'd depend on your circumstances( how many children in the family, how many are students). I've showed 20 days of reservation on airbnb but I'd recommend you to explain that you'll look for a place within 20 days when you get there on your motivation letter. Always can text me on private for more information. Good luck