My partner and I stayed at this apartment for 3 months so we had a good amount of time to get a feel for the area.
The apartment is situated on the second floor right at the back of a big apartment building so it feels really secure especially at night when you have to get through three locked doors to get into the apartment. It has a balcony that overlooks a small terrace but is surrounded by other apartment buildings and can be a bit dark at times. The only view you see out the windows is of a concrete wall... That would be a bonus in summer though as it would stay cool. It is roomy and we didn't feel cramped at all during our stay. The doorman David is very friendly.
The area is close to a central business district which means it is very busy during the week but quiet on the weekends although there is some good night life near the apartment all week. The apartment is right next to Plaza San Martin which is a beautiful Plaza and where a walking tour starts from. As it is only a short walk to the transport hub of Retiro it is easy to get anywhere else you want to go. Florida street is only a block away and the theatre district is walking distance.
Martin was quick to respond to any questions we had. We even managed to lock ourselves out of the apartment on the weekend and he met us straight away with the spare keys.
The kitchen was a little under equipped and we had to buy a few things like a chopping knife and cutting board. The kitchen does have a stove with oven, microwave and full size fridge though.