The apartment is spacious--it is good for couples and single travelers. It also offers a very local experience of the area: it is rather an old building but decently maintained.
The location is very central to tourist places. Plaza de Mayo is 10 mins away. San Telmo is 20 mins away. UCA is 25~30 mins. It felt pretty safe even during the night. There are tons of restaurants, shops and grocery stores around.
If you're a light sleeper, you will need earplugs, as the noise from the street is somewhat loud and the cars come and go the entire night.