Here is a 2 star and only $100 or less...but look at the current trip advisor ratings...Very good. Very European, nice area of town, easy cab ride to the port. When we were there food markets would open near the hotel during the day and at night, night clubs popped up around 10pm. We felt very safe walking here. Las Ramblas as I remember was a 10-15 minute walk away through alleys and streets....easy to find. It is a short walk as well as a short walk to the metro station.
Hotel Acta BCN 40 - UPDATED 2017 Prices & Reviews (Barcelona, Catalonia) - TripAdvisor
Here is the hotels web site
Hotel Acta BCN 40 | Centrico hotel de 2 estrellas en Barcelona