First the pros: great area, and the guesthouse is clean and nicely kept.
But the problem is that it is definitely NOT worth what they charge: it is a premium hostel or bed and breakfast at the most, not a 150euros-a-night hotel. We stayed in a proper hotel the night before on the nicest part of Passeig de Gracia and paid 160 for a proper 3-star room. It is ridiculous that an Ikea-furnished flat, with no reception, a tiny lift, walls so thin that you can hear the toilet being flushed next door, and a less than basic breakfast charges these rates. Shop around and you'll find a much better place for the same money.