We had a great time in Guido's studio apartment. We never met Guido, but he responded very quickly to all our messages and he was very helpful. We met his sister at check-in. She was very friendly and welcoming.
The location is great (Recoleta) and the flat is cosy and feels like home. The wifi is good, the shower was hot, and the kitchen is stocked with pots, pans, salt and pepper, and even paper towels.
The flat has a lot of small touches that we appreciated including: an extra towel, a hairdryer, extra toilet paper, and a few travel booklets about Buenos Aires.
If we are ever back in BA we would definitely stay again. Highly recommend.