The location is perfect! Views of Segrada Familia, walking distance to metro. Only 10 minutes from the train station, plenty of places to eat and drink. About a 30 minute walk to the Gothic Quarter and 45 minute walk to the Med. I would suggest investing in some metro passes if you are spending the majority of your time in the Gothic Quarter or by the sea. Check in was very easy.
Do not book if you cannot do stairs. There are many stairs. Beds were incredibly comfortable and plenty of windows. Would recommend.