All perfect praise be to Allah, the Lord of the worlds. I testify that there is none worthy of worship except Allah and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.
If the house owner whom you asked about the direction of the Qiblah is a Muslim who is not known for being disobedient, then you are blameless for depending on his answer. Also, you are not required to make up for the past prayers if you prayed towards a direction near to the correct one. However, if you extremely swerved from the correct direction, as when the Ka‘bah was at your back, right or left side, then you are required to make up for those prayers that you prayed while facing the wrong direction.
Allah knows best.