This hotel is in the Eixample district. Our street was lovely and a little upscale surrounded by many restaurants.
The "hotel" was hard to find as they essentially have one floor in an old building and there is only a small plastic label on the intercom system. Our driver seemed perplexed as well, but upon getting out of the car, we figured out that we were in the right place.
Despite choosing to pay upon arrival, we received an email a few days prior, asking us to register and pre-pay. We were on a cruise and not on a secured internet connection, and besides, we were not expecting this. Was it legit? Seemed strange. So it did cause a little stress. The day prior to check in, they emailed again (not through hotels.com, but email), strongly requesting us to check in, saying that we needed to do this to get get the door codes, so we initiated the procedure. It asked us to send our passport info (did that), and then our credit card info, (didn't do that). Remember, we are on public wifi... They then make it more nerve racking as the reception has "limited hours", so we don't know if any one will even be there... yikes.
BUT- it all ended up okay, the emails were in fact legit, and there is an attendant there in the mornings. She was helpful and they have locking storage you can use, couches and a washroom if you need to rest.
It will be tight if you have 4 cases, the space is limited, but it was very usable and we would stay there again.