We really, really enjoyed our stay at Lucila's place. We were in BA for 3.5 weeks and it was a wonderful homebase for us. It's centrally located between many different neighborhoods making exploring the city from there super convenient!
There are an endless number of great spots for food & drink anywhere from 5 to 20 minutes walking. Palermo Soho, where we spent a lot of time, is about 15 minutes by foot. If you need a quick / convenient meal, there is an awesome place basically directly under the apartment building that Lucila recommended called Kalimnos. Awesome. We ate there a ton! There are great grocery stores and smaller specialty food stores (like a great fish market) nearby as well.
The apartment itself is very well-equipped and comfortable for two people. We loved all of the sunlight during the day! The bedroom is comfortable and has great clothing storage which was soooo wonderful for us. It was one of the best clothing storage situations we'd encountered. It sounds silly, but when you're posting up in a place for awhile, unpacking into something so convenient is great.
We used the kitchen a lot which was well-equipped and enjoyed sitting out on the terrace, enjoying coffee on the days we didn't get right out to explore or head off to our Spanish classes. There is a great Spanish school called Vamos about 10 minutes away walking, if that's of interest to you while you're in town.
Lucila was responsive and helpful anytime we needed her, which wasn't much. All in all, really enjoyed having this as our home base in BA!