I’m currently in BsAs, my second visit since December. Cash is king. You will get nearly 200 pesos per US dollar. Your hotel will help you find a reputable place to exchange money. Our dinner last night at a very nice restaurant was about $8,000 pesos. $40 dollars at blue rate; $80 with credit card. I have stayed at Sheraton and Sheraton Park Tower and Intercontinental. All are recommended. Not as fancy as Park Hyatt, but quite nice and much more reasonable. Using the blue rate for hotels is a bit tricky. It will cost you half as much if you pay in cash. But you will have to pay 21% extra in taxes for a cash payment. If you pay with a foreign credit card you avoid the tax. Overall much cheaper with cash. Taxis are cheap, but sometimes harder to come by. Uber is available as is Cabify. You can download the app and pay with a credit card or in cash. I never had a problem entering Argentina with my Covid insurance. I kept a copy of my travel insurance which included Covid, but I was never asked about it. Coming from the main airport I have always used taxiEZE to get into town. They have a kiosk just as you exit immigration. You pay at the kiosk and a private driver will take you to your destination. I just checked the website and the price is 3600 pesos. $18 or $36 depending upon how are you bought your pesos. I’m pretty sure you can pay with credit card but you will pay at the official rate. Feel free to direct message me, I will be in Argentina for another month.