Где жить
Serdica vs Vitosha Blvd vs Lozenets quiet.
Serdica / Nevsky zone
Плюс: walk ruins cathedral; metro hub. Минус: traffic noise Vitosha Blvd proximity.
Vitosha Boulevard
Плюс: restaurants terraces; tram south Vitosha. Минус: tourist menu markup 30%.
Lozenets south
Плюс: quieter sleep; parks. Минус: 15 min walk centre OR tram.
Airport zone
Плюs: early flight. Минус: 30 min metro each city visit — wrong if 2-night city break.