Ruben's place is small and compact but easily the best equipped place we've stayed at in Buenos Aires. It's clear Ruben has put a lot of thought into creating a functional and comfortable stay for guests.
He had a fully stocked kitchen, including salt and seasonings (not provided anywhere else we've been). The shower was sparkling clean and he provided soaps and shampoos, as well as fresh towels. The airconditioning worked great and the TV pulls out so you can watch it from bed. Even the building lift worked very efficiently.
The place was very easily accessible by public bus and it only took us 15min to get to the airport from there. Ruben met us at the door and was incredibly accommodating with our delays. He took the time to really introduce us to the place and answer any questions we had.
Overall a fantastic spot for an overnight stay in BA! The space might be tight for a longer term stay for a couple, but pretty perfect for a solo traveller who plans to be mostly out & about