I really enjoyed staying in Ricardo's apartment! The location is great especially for tango dancing, because it is very close to many famous milongas. The zone is full of useful shops, close to public transportation and very safe. In addition, there is a 24h guard which provides additional security.
The apartment is nice and equipped with all you need also for long staying (if needed, ask or bring the hairdrier ;) ). There is also a handyman in the same building: I had a small issue with bathroom and he immediately fixed it even if it was Sunday. Being at a high floor, the apartment does not suffer too much from traffic noise; moreover, it can be refreshed easily in summer just by opening a window (there is also air conditioning in case of very hot weather). Internet connection was very reliable and I was able to make voice calls and work.
If I have to name a defect, the only one I could find is that there is a shared area for parties just above and it can get loud in the weekend. However, parties were always already over whenever i went back home after a night out. So, overall it was not a big problem.
I would definitely recommend Ricardo's apartment.