I had a lovely time at the Arco Hotel Barcelona. The room was very clean and modern, had comfortable beds, and a nice view from the 5th floor. All the staff we interacted with were very kind and helpful.
It's a great location if you're looking to avoid the crowds of the city center and stay connected to the rest of the city via public transit. Very safe area surrounded by many restaurants, and very close to Parc Montjuic! Also walking distance from one of the Aerobús airport shuttle stops.
The hotel breakfast was a bit underwhelming, but I still found having access to the hotel breakfast to be beneficial for grabbing some quick coffee and food before heading out for the day.
The hotel is a bit on the pricier side, but I do think it is worth it for the great location, high-quality rooms, and easy, inexpensive access to the airport. If I return to Barcelona, I would absolutely stay here again.