Most of the time the landlord was not there because he and his wife owned another house about 45 minutes away. One day the landlord came to our apartment to tell us that he and his wife were going to Finland for a few weeks to see family and he gave us his cell number in case of emergency. Now that cell phone was the only phone he had. He had no phone in his apartment, basement or the attic.
About a week into his trip, My partner and I started to hear a phone ring and it sounded like it was coming from his apartment on the 2nd floor. We both heard footsteps coming from the 2nd floor as well. However, when we went up to the 2nd floor all the doors were shut and locked. As soon as we would go back down stairs to our apartment we would once again hear a phone-ring, but with a different ring tone than what we were used to hear from the landlords cell, and hear foot steps. This continued everyday for another week and before called the landlord in Finland to tell him what we were experiencing.
To our surprise, he informed us that he too had heard footsteps and a phone-ringing when his apartment had no one in it. He also informed us that he himself hears footsteps and mystic phone ringings that seem to be coming from his kitchen, steps or the attic while he is there. However, when he walks into the kitchen or up the attic he sees no one.
Hearing a phone-ring and hearing footsteps continued on and off until we moved out about a three years later.