The absolute best place you can stay!
The apartment is exactly as it is pictured in the advertisement. It was clean, well decorated, and had everything I needed during my stay. If you stay multiple weeks, the cleaning person comes at the midpoint and cleans for you. All of the linens, dishes, silverware, and cooking supplies were adequate for my use.
The apartment is in the BEST location. Hundreds of restaurants, bars, and shops are all in walking distance. Expect your schedule to be adjusted to BA time... Restaurants get busy after 10PM. The food is amazing. Bars are open until at least after 4AM. Transit is very close and takes you pretty much everything you want to go. You can now but the SUBE card at the station which was very helpful.
Lara and Sara were wonderful. Prompt, attentive, and responded quickly to any questions or situations. Otherwise, I didn't hear from them. (Though I always knew they were just a text message away!).
Don't believe the hype that most companies sell you in staying in San Telmo. THIS is the place to stay and Lara/Sara's place is absolutely a must.