Teresa's flat was a great stay for us during our visit to Barcelona. We stayed for a month and really enjoyed it. The flat is an easy 5 minute walk to the nearest subway station, about 10-15 minutes walk to the Sagrida Familia and is surrounded by a ton of restaurants, grocery stores, bars, and everything else you might need during your stay.
The flat is as shown in the photos, we really liked the mix of the retro charm of the flat and the modern amenities indeed. Super fast Wifi, good sized and supplied kitchen (drip coffee, basic pans, great washing machine, convection stovetop and oven, etc) , and a good space for sure for 2, with enough room to have a third stay comfortably in the second bedroom (which has a single bed).
The bed was very comfortable in the main bedroom.
Communication with Teresa was very easy and she was wonderful to discuss with. She met us when we arrived at the flat which was late in the evening and the check in was very easy.
There are no issues with the flat beyond just some city noise and there is a dog park just around the corner which can be a bit noisy during the day, but nothing that was any real issue during our stay.
This stay was during November, so it was for sure quieter in the city then and a great time to visit.
We would be happy to stay here again and can fully recommend it.