Communication was great, and check-in was easy. Prior to arrival, they sent us a list of building rules (which were also posted on the back of the front door). Everything was clearly laid out and easy to understand. We arrived an hour early and they were able to accommodate us.
Due to the entrance requirements for Chile during the pandemic, we stayed here for 11 days. The apartment has some modern upgrades, and the bed was very comfortable. Despite the photo of Netflix on the ad, access to a subscription is not included. The apartment was cozy for 2 people, but with more people than that, we feel like it would be cramped, even though they offer a full-size sofa bed (unless you are used to staying in shared hostels).
The view from the apartment was great, and the pool was nice on the hot summer days. The small balcony was also nice to hang out on. The apartment does not have AC, but if you open all of the windows and the sliding door to the balcony, you will get a nice breeze in the afternoons. They do have a tower fan for use as well.
Water pressure and water temperature were nice in the shower. They provided hand soap in the bathroom as well as shampoo and conditioner. The kitchen does come equipped with dish soap. Because we were in quarantine for most of our stay, we cooked most of our meals. We had no problems with the oven or the stovetop. The combination washer/dryer was incredibly useful for stays longer than a week.
Location wise, there is a decent grocery store about 2 long blocks from the building; as well as 3 smaller asian grocery stores, about 4 blocks away. The building is located along the main river that runs through the city, which has a nice park for walking / running / biking, etc. It's about a 1 km walk to Bellavista, where we were able to find lots of bars and restaurants. It is true what some other reviews have said- there are homeless people camped in front and around the building, but we had no problems with anyone during our stay.
To comment on what others have said, there was noise, even on the 21st floor. However, this was no different than the noise you would hear in any big city (fire engines, traffic, honking, etc.)
Overall, we would recommend staying with Felipe & Oliver!