I loved staying at BCN Fashion House in Barcelona as a solo traveller. The room was large and the bed was very comfortable. It was extremely clean and I had my own little balcony. It is very centrally located and easy to walk to most of the sights in Barcelona and steps away from a metro station if you prefer to use public transport.
The bathrooms were shared but there was never an issue with cleanliness or accessibility. Great Value for the cost. Also a lovely courtyard to relax or have breakfast in. I would definitely stay again if I was in Barcelona.