Fantastic location! Metro stop on the corner, fantastic fresh food market nearby (Barcelona Flower Market / Mercat de la Concepcion), great cafes of course and short walk to shopping and food around Passeig de Gracia, as well as Casa Battlo, La Pedrera. Only a 20 minute walk to Sagrada Familia and metro makes everything even closer.
We didn’t spend a lot of time in the apartment except to sleep and take breaks, but it was also a nice space for a slower paced visit where you are expecting to spend time there. We were a family of 5 with teenagers and had plenty of space to spread out and relax, and it was easy to come and go, send someone home if they got tired, etc. Everything was clean and comfortable, nice decor, not super luxurious. Like most Airbnbs, the photos are all professionally lit wide angle shots that exaggerate the size and light and shininess of each room, and the furniture and fixtures are more run down and used than pictured.
Well equipped kitchen and room to sit and eat if you want to cook - if we had longer we definitely would have made some meals from the market. Washer dryer was great to have (compared to a US washer dryer, much smaller and slower- responsible energy use!).
The 3rd bedroom with the bunk bed is very small - perfect for kids who only need space to sleep or stare at their phones, and again there is room to spread out in the living area and patios.
Wifi was fine for normal use and better in the front room - not quite up to the strains of 3 teenagers steaming video etc.
We were not there during hot summer, but the place was stocked with lots of fans and would have good airflow if you opened the patio doors. AC unit only in the living room.
Lots of construction in the immediate neighborhood including on Carrer Girona outside - we visited in off-season so probably expected. Easy to just walk a block or two away from the digging, and the noise did not bother us, bedrooms are in back opening to a pretty courtyard, with lots of other apartment buildings overlooking it.
All the holiday lights and Christmas markets were beautiful. Catch the holiday light show on the facade of Casa Battlo every 30 minutes after dark.