Since many reviews already on line let me about you about restaurants.
Directly below the apartment a
Great coffee shop,w self help pastries, great croissants (medialunas) coffee and all kinds of pastries
Dinner across the street, La olla de Felix, a bit formal, white tablecloth starts late, say 8 pm
Dinner around the corner nice place, Rigoletto not fancy but tasteful, good food and accommodating people Willing to make you an omelette or anything else you fancy Fixed daily menu available
A block away Quotidiano..specializes in home made pastas, very popular after 8 pm, walkup reservations taken try the breaded shrimp (langostinos) on a skewer, appetizer served w curry or other sauces. You can eat outside though you may find smokers there.
A sushi place right around the corner, we did not try it. Argentina is not known for its sushi
2 blocks away, across plaza Vicente Lopez, a traditional and famous pizza and general restaurant called Los Inmortales. Often full of celebrities and huge meals, a breaded chicken steak (milanesa de pollo) and salad where you choose the ingredients was enough to feed both of us.
Food is cheap for people who bring cash (atm machines work fine here but keep you fingers on the dispenser slots, the machines will otherwise swallow your money back into its innards very rapidly)
Restaurants will discount 10% for cash payments. You can also pay by CC but I suggest you take a copy of your passport or drivers license w you since an ID is requested- for CC payments.