Hello Leeluu, am happy you have enjoyed your stay in Barcelona, its a wonderful city. However your description and evaluation of the apartment is rather unjust and exaggerated . The apartment is not a luxury flat , nor its advertised or priced as such. There are plenty of luxury and high quality apartments in Barcelona for 80-200 Euro per night. However you have paid only 15 Euro per person per night during your stay, for entire non share apartment in the city centre. For that price you wont find a shared hostel room in Barcelona....
Also since you dont have a reference point you are not able to compare my apartment to others. The whole Ciutat Vella area is old and antique, 90% of buildings dont have an (email hidden)e shower is of a regular size for this area, and there is nothing wrong with the furnishig or cooking facilities, nor electric appliences, They all work just fine as you can see in the rest of 20 other referenes I have received from previous tenants.
I hope that you can be more objective when evaluating future apartments rented via Airbnb , am sure the hosts will appreciate it.
Wishing you all the best!!