What can I say about Alejandra's place that has not been said? I've lived my entire life in Buenos Aires and when I moved abroad and came back for Christmas I decided to stay in San Telmo and it was an amazing experience.
This place is right across the San Telmo market, where you can buy lots of stuff including fresh fruit. There are so many options for dinner and lunch in the same area that you can eat at a different place every day. On Sundays you have the San Telmo feria one block away but you won't get bothered with people on the street where you live, which is nice.
The apartment itself is quite comfortable and has everything you need to cook every day in case you don't want to go out.
The rooftop of course is the icing in the cake.. if you are up to the challenge, you can try your bbq skills or you can just chill in the couch and have some mates.
Communication with the neighbours was fast and comfortable. Thanks for everything!