My boyfriend and I stayed at Carlos's apartment for 3 weeks and had an awesome stay! We originally chose this apartment because of the amenities - 2 rooftops, one with a pool and the other with a grill / outdoor seating area - and gym access - since we were going to be working during the week and wanted to be able to get outside for a few hours each day. The wifi was pretty fast and we didn't have any issues. The rooftop pool is great with lounge chairs facing the sun and a nice breeze. Also a great place to watch the sunsets! Although we didn't use the gym or rooftop grill area it did seem like a fun place to hang out with tenants there almost every evening cooking.
The actual apartment itself was great - the kitchen had everything we needed for cooking and it was nice that it was a bit separate from the living room. The living area had a comfortable couch and table with 4 chairs which made a great work area for us during our stay. We also found ourselves using the apartment balcony quite a bit at night. There are 2 bathrooms in the apartment which was also a huge plus, (great water pressure in the shower) and the bedroom was cozy, comfortable bed, with a huge window (and blackout shades). There is a good amount of closet space.
Since we had an extended stay, there was a weekly cleaning lady included and she did an amazing job (changed the sheets, brought new towels, etc). There is also laundry in the basement we used a few times during our stay.
Overall we had a great stay here! We felt super safe with the 24/7 doorman, and it's a relatively quiet area but close enough to Plaza Serrano (about 0.6 miles walk or a 5 minute cab ride) that we had easy access to tons of good bars and restaurants. If/when we come back to Buenos Aires we would definitely stay in Carlos's apartment again!