Just got back from a 3 night stay here. The flat is amazing! We had a 2 bedroom, 2 bathroom flat (3 people). The ladies in the office were very friendly, we arrived in Barcelona at 10, they very kindly let us store our luggage in the apartment even though it wasn't ready for us.
The apartment was clean, comfortable and in a fab location. The neighbourhood is friendly, lots of locals (few tourists - just the way we like it). Cafes, bars, restaurants are many on the doorstep and within 5 minutes walk you will find anything you want.
There is a small shop next door as well. The balcony overlooked the square, it was lovely to watch the people pass by and go about their business.
Contact with the hosts was easy, sent a whatsapp message when we landed. We didnt need to contact them during our stay, but contact numbers are given should you need them.
I have been to Barcelona many times, and this was by far the BEST place I have stayed. I will definitely be staying with them again next time I come!