My mom and I had an amazing time in BA! We ended up spending all 6 days in the city and had so much fun. I wanted to thank everyone on the forum for their help and add these tips/hints:
The best tour that we did was the El Zanjon de Granados in San Telmo. Our guide was amazing and the history, tour and home were a great surprise.
Our biggest disappointment was the Jewish tour that we booked. We felt we did not learn or see anything of the current Jewish population and didn't even go to where they live. We paid quite a bit of money and did not feel we got much in return.
We loved seeing a Tango show (we saw Los Angelidas) and went to Cafe Tortoni one night just before 11:00 to catch another show. If you want to see the show there, we were told you need to go during the day to get tickets. It was full and we missed out. Bummer.
Another highlight was going to the Opera. We thought that would be the best way to see the Opera House. What a thrill! Tickets were not horribly expensive and sitting and watching the show in that beautiful building made for an amazing night!
We spent almost a whole day strolling in the stores in Palermo. What a luxury! Note that most stores do not give refunds, only exchanges. Salespeople were so nice.
Our best meal by far was Cabana Las Lilas. Yes, it was more expensive than some other "top" parillas, but the food and service - and location, was so much better than La Cabrera. We spent our last lunch/afternoon sitting on their patio and partaking in all of the extras they offer - the amount of bread was amazing! My mom and I shared a steak order and it was more than enough. I also suggest getting coffee for dessert. It comes with a complimentary cookie plate that is more than enough dessert. Lunch, with wine, was well under $100, including tip.
Oh, and we stayed in the Loi Suites in Recoleta and thought the hotel was just great. Breakfast was included and the room was quote large. We thought the location was excellent, but we cabbed everywhere. We felt totally safe walking around the neighborhood at night - which we did most nights for dinner or dessert.