Loved my stay at Andres and Francisco's place - I stayed for almost a month during the first weeks of the COVID lockdown - so I was there a lot.
The place is exactly as described, small but well designed so it didn't feel too small even though I was stuck inside all the time. There is a decent shower and hot water (excellent by Mexican standards) and a comfortable bed, which was a great place to watch some Netflix on the TV. I cooked every day in the kitchen - having a water filter was the BEST to avoid lugging bottles up the stairs.
The building and street all felt very safe, it was nice to stay in a building that felt local. The 3 flights of stairs were super easy, there were just a couple of narrow doors to get through up the top which isn't a problem once you get your luggage in. It was fairly quiet while I was there, it's set well off the street. It is an apartment building so you can hear neighbours coming and going and music etc, but nothing too crazy, and nothing late at night.
The location is great, Mercado Medellin is meters away and if anything were open I'm sure I would have enjoyed all the restaurants, bars and cafes nearby! Also is a short walk/bike/uber to nearby Roma Norte and Condesa.
Lastly - Andres was awesome, he regularly checked in on me to make sure I was ok with everything going on (without being intrusive), and was always asking what they could do to help out and make sure i had everything I needed - which went a long way in an uncertain time in a foreign country!