I will try to this short and simple. Stay at this apartment. Stayed for a week with my wife and teenage son and cannot think of way our stay could have been improved.
The apartment is spacious, clean and very comfortable. All amenities that you need for a longterm stay are there and in good working order. There is a large living area with two windows looking onto a park where the locals gather to chat and play petanque. The kitchen is modern though if you are like us you will only use the refridgerator to keep drinks and a few snack as you won't want to miss out on an opportunity to eat at one of the local bars and restaurants. The beds are comfortable and the bathroom has a wonderful rainfall shower and a huge counter to lay out all your toiletries.
A previous review mentioned that there is separate room where the toilet is located. There is also a sink in that room which made it convenient for my wife to use for makeup, drying her hair while my son and I took our showers, allowing us to get out of the apartment faster to explore Barcelona.
And the location was just as great. It's a few minutes to the metro station that will take you straight to the heart of the city. All around are amazing eating opportunities and wonderful squares where you can act like a local and hang out for a drink and a snack. Barbara provided us with lots of suggestions for great meals and she was waiting for us at the apartment when we arrived. Like I sad at the beginning, stay at this apartment.