My friend and I stayed at Tomasz's for three nights last month. The apartment is located within walking distance to pretty much everything you need for your trip to Barcelona: tourism attractions, beach, subway station and train station.
One thing I’d like to comment on is that you may not easily fall asleep with the windows open due to traffic and street noise coming from outside. Yet a fan is provided to keep the room cool. My friend and I opened the window and used the fan at the same time as the weather was very hot during our stay in Barcelona.
Other than that, our stay at Tomasz’s was perfect. Just as described from the listing and most of the reviews!