Elisabeth's apartment is incredible! We stayed in the old city for one night and then two nights in Gracia and did not regret it! It was great to see another neighborhood in Barcelona, not only the most common tourist areas. There is a local food market nearby, lots of shops, and so many coffee shops. Check out Mama's cafe on the street directly next to Elisabeth's apartment. It is great for breakfast!
Elisabeth was very accommodating for our check in and out. She let us bring out bags over early in the morning before leaving for an all-day excursion and let us store our bags before our flight on our last day. The apartment has a washer which was also great for doing some laundry. We definitely didn't enough time in the apartment to fully appreciate all it had to offer (including the balcony!), but I would certainly stay here again when returning to Barcelona!