Alejandra's studio is delightful, it's very well equipped & we found it had everything we required for our week in Buenos Aires. There are two doors to access the studio, one on the street that leads through a small courtyard to the stairs leading up to the second door & into the apartment; this means it feels very safe as both doors have good locks.
The studio has plenty of natural light &, although it is located in a busy area , it's set back from the street & it's quiet inside ...we had absolutely no problem sleeping.
Alejandra was away when we visited but communication with her was good & her delightful friend Carolina (who lives next door) was available to meet us to let us in & to help with lots of very useful information on what to see and do.
Alejandra recommended we pre book a taxi from EZE airport on line (using www.taxiezeiza.com) to San Telmo; this was a great tip & worked well for us; we used this service both from & to the airport.
We found we could walk from San Telmo to most of the places in Buenos Aires, that we wanted to see; sure we walked a long way on some days but it was very interesting to be among the people & to soak up the street life & the architecture. If you don't feel like walking there are buses & taxis close by.
We were very happy with Alejandra's place and we would certainly stay there again.