Our hosts were very kind and welcoming. They helped us with our luggage up three flights of stairs (no lift), showed us around and helped with local information.
The tiny room has a view of the backs of the surrounding apartments. The mountain view is a bit exaggerated. The shared living room has A/C, but not the bedroom, which has a ceiling fan.
Workspace and dining table is outside in the shared living room. There is a small round table in the room with two small stools.
We never saw the kitchen and am not sure if it can be used by guests. There is one mini fridge and microwave in the room and a small electric hotplate.
It is not waterfront by any means. According to Mr. Google, it’s a 35-minute walk to Barceloneta Beach.

We arrived with our car and found a space in the street near the house. There is a two-hour limit for parking during the day and the cost is €3.50 per hour. Free street parking from 20:00 to 08:00 next day, if you can find it. Paid parking in a secure inside lot around €30 per night. I do not recommend you book this property with a car, Barcelona is not a car friendly city. On the other hand, public transportation is excellent and you can walk to most places.
You should be aware that the room and bathroom are very small and a bit tight for two persons with luggage.