I stayed in Marta's apartment for just over a month and had a positive experience. The apartment is well located on the border between Palermo Chico and Recoleta. The area always felt safe and I had no issues in the area at night, which was important to me as a solo female traveller. The Las Heras park is one block away and the larger Bosques de Palermo park area is within walking distance. There is a good range of supermarkets and restaurants within the immediate vicinity of the apartment. There are excellent transport links too, with plenty of bus routes on Avenida Las Heras just one block away and Avenida del Libertador two blocks behind. One downside of this is that there is quite a lot of road noise throughout the day and night. However, other guests have commented that the area was very quiet, so this could just be down to the fact that I am quite a light sleeper and was new to the general noisiness of Buenos Aires.
The apartment is just as it appears on the photos and is clean and comfortable with a nice little balcony. The bed was very comfortable and the wardrobe provided a good amount of storage space. The kitchen was well stocked with enough pots, pans and crockery to get by. There were two things I had a slight issue with. A lot of natural light enters the apartment in the mornings which has a lot of advantages, but can be a downside for light sleepers. As mentioned in a previous review, I also had some issues with the Internet connection, which proved quite frustrating as I was working remotely for a month and was very reliant on Internet. Marta and her niece Martina looked into this and tried their best to help, but it was difficult to find a solution. The Internet was OK for less intensive use such as general browsing, but as a heavy user looking to connect to a remote work server and VPN networks and stream TV series and films online, I did find the overall speed an issue for my requirements.
Marta is based in the US and her niece Martina deals with check-in and check-out in Buenos Aires. Both were very pleasant to deal with and were always responsive, friendly and keen to offer recommendations and look into any issues.
On the whole I was satisfied with my stay in Marta's apartment. I did encounter some issues, but these were largely due to my specific requirements/preferences. Overall I think the apartment offers a lot of advantages and is a good base to stay in Buenos Aires.