Nicolas is a very kind host and is easy to communicate with to arrange check in and out times. He explains everything thoroughly when you get to the apartment.
Although Nicolas is a very nice host and the apartment works fine (good hot water and pressure, comfortable bed, amenities for kitchen, clothes and dish washer and clothes drying rack, patio with table, chairs, and umbrella), we were unimpressed with the apartment under the dome. There are finishing touches that should be addressed to make the apartment what it could be. But the building is safe despite the potential for insecurity outside the main door.
The Microcentro is not a very pretty part of Buenos Aires. It's next to the hustle and bustle, there are many homeless in the area, and the streets are quite dirty every night (although they do get cleaned up regularly). We should have researched the area better and for that we cannot blame our host at all. The Microcentro is close to Teatro Colon, the apt has a great grocery with wine, cheese, meat, etc., camping store, photocopy services if needed, and the best coffee shop with locally roasted beans right next door.
We would not recommend this neighborhood to stay in if your intention is to explore the beauty of Buenos Aires. But if you're in town for business or some other purpose near the Microcentro for a short stay, then this apartment will be fine, but it won't wow you.