Lucy's apartment was a good find for us. She was a great host, meeting us at the apartment on arrival, letting us know about the apartment facilities and the neighbourhood, and warning us that we had unknowingly booked our time in Barcelona during the firecracker-laden celebration of St. Joan/ summer solstice.
The apartment itself is clean and has all the necessities. The balcony is a nice place in the morning and evening, and there are great breezes when the doors and windows are open. Small note, the tap in the bathroom could be a little longer. You may not want to put anything nearby if you don't want to chance of it getting wet/splashed. Couch was very comfy and the beds were nice.
The neighbourhood was lively and had good pica-pica restaurants nearby. Lucy gave us a great summary of the area and recommendations we enjoyed. Much of the city is more walkable than you might think from here, including the mountain up to the castle, and over to the Parc de Ciutadella. However in the heat of the day I would definitely recommend starting at the nearby Metro station for trips up to Eixample and the Sagreda Familia.
Greatly enjoyed the bottle of cava left by Lucy in the fridge as well. A great welcome and started us on it for the rest of our time in the city.