I spent 2 nights at Elitsa's place. The apartment is quite nice and is located in a calm area. It has a cool terrace and plenty of light. The bedroom is confortable and has enough space.
Although her place is not exactly in the city centre you can get there very easily since it is just a 15 minutes walk. Plus, the area around the apartment offers plenty of nice cafés, restaurants and shops.
Elitsa was a great host too. She is quite friendly and communicative and received me very well.