Bright 2 room apartment at Checkpoint Charlie for Exchange

Hi, our family is growing and we need additional space we are looking for a 3 or 4 room apartment in exchange for our 2 room 65 sqm apartment located very centrally at checkpoint charlie yet very quite. U6 na bus stop are 50m from the apartment and all necessities like grocery, apotheke, doctors, parks, gym are with 1km radius. Apartment has an elevator and a large balcony and windows, so sunlight is not a problem.