TLDR: Hands-down the best place to stay in Buenos Aires! Book it now!!
The apartment is seriously spectacular-- it's huge, quirky, unique, and really feels like home. All of the amenities are spot-on, with comfortable beds, a nice kitchen, multiple bathrooms, an AMAZING terrace, little balconies attached to two of the rooms, and at least 20 different places to sit with a coffee and read. The WiFi is very solid, and allows you to stream netflix or make Skype calls or whatever else you need to do online. The whole place is sparkling clean, thanks to the lovely housekeeper Norma, who will also help with your laundry for a small tip.
And Maria and Enrique are both absolutely wonderful-- friendly and open and attentive, while at the same time respecting your privacy. They're great company to chat with, and have some great stories and history lessons about the city/country, and are warm and inviting. Most of the time I tend to venture off on my own, but if I'm home for lunch they make me feel welcome to sit with them and share a meal. On a couple of occasions, they've also hosted "parrilladas" (Argentinian bbqs) on the terrace for the guests, which have been loads of fun (just be careful with the Fernet and cola-- their son Augustine pours generously...makes for a fun night, but a rough hangover).
They also make your transition into Buenos Aires as seamless as possible. They were super communicative leading up to my arrival, and helped set me up with a trustworthy taxi from the airport. When I got to the apt., they had a map of the neighborhood waiting, with the grocery stores, ATMs, money exchange places, best restaurants, etc., marked. They also had a card for the "Subte" (metro/subway) ready for me, which made it easy to travel around the city right off the bat.
Location-wise, it's perfect. Recoleta is a very calm, quiet, safe, and non-touristy neighborhood, with some decent bars, restaurants and cafes close-by. It's about a ~20 minute walk to the famous Cementerio de Recoleta, and about a ~30 minute walk (or a 5 minute Uber, U.S. $2.50) to Palermo (more touristy), where you'll find tons of great bars and restaurants and cafes. Right around the corner from the apartment (~1 minute walk) is the entrance to the Subte, which is a super quick, comfortable, and cheap way to get "downtown" to the some of the more famous attractions. There are also several major bus routes that pass by that can get you quickly to most of the rest of the city.
I've been staying with Maria and Enrique for a bit over a month now, and have decided to extend my stay until the end of November, when, unfortunately, I'll have to head back home. If I could, I'd stay here another six months, at least! I can confidently say that, so far, neither the photos nor the reviews do this place, or these people, justice.