Mercedes' apartment was fantastic for my two week business trip!. I had a late flight in that was delayed and for a very small fee, she made arrangements to have someone meet me at the apartment for check-in. She even set up a WhatsApp group so I could stay in contact on my arrival and departure status. Although I didn't need anything, she made herself available in case I did.
The beds were comfortable, the place was super clean, and the location was perfect for a stay in Poblenou. I could walk in one direction to the beach in 5min or the other direction to the metro to get anywhere else in Barcelona, not to mention delicious restaurants all around. The wifi worked great, I spent many nights after work enjoying a glass of wine on the quiet terrace, and she stocked me up with coffee for the mornings. I highly recommend staying with Mercedes!