Please correct the mistakes in my translation.

It turned out to be Nick`s and Lora`s house.. He parked the car and came up to the door. He saw a pretty blonde through the window, standing by the fire-place. Apparently she was the mistress of the house. (Can I say "who might have been Lora").
He rang the bell. "Is everything all right, ma`am? I saw a light flickering and I decided to ask whether everything is all right."
"Thank you, I had to change an electric light bulb myself as my husband is unwell. Maybe I have changed it not skillfully enough but I managed still to do it somehow.

Thank you