I had a pleasant one-month stay at Bernat's place while visiting the city.
The location and neighborhood are great -- the grocery store, bank, post office and shops are about 10 minutes walking distance. On the corner of the street, there are two different bus stops. I was able to walk or take the bus anywhere in the city. I also felt safe in this quiet neighborhood.
The apartment is in an old building, but the apartment itself has been renovated. The kitchen was quite small and awkward, so I'd keep this in mind if you plan on doing a lot of cooking. The building has central heating, but at times I felt it wasn't enough. However, there's a space heater available if you need additional heating. I worked from home during most of my stay and had no problems doing so.
Communication with Bernat was excellent. All instructions were clear and timely. I wouldn't hesitate to book another one of Bernat's listings.
Overall, I'd say this is a solid choice for the solo traveler.