Petz and Mari are lovely and very welcoming people. They are open to giving advice on activities in Barcelona, like the Festival de Gracia they advised us to go to (and really, we would not want to have missed this!). Also, they provided Catalan breakfast every morning and even baked cake to go with it for the weekend. The appartment looked exactly like in the photos and we loved the look and feel (especially the tile floor!). Great location too, very central and close to the metro stop (Urquinaona).