Overall we were very happy with our stay in Ivan’s apartment. It was easy to find and his housemates were very welcoming. The room itself was very spacious and clean, with a nice balcony overlooking the station. Ivan had left a diagram of useful instructions, so even though he wasn't there to greet us we felt welcomed.
In terms of location, the apartment is very central (literally 5 minutes to the Place de la Comedie) which meant that we could walk everywhere. The only possible downside (for light sleepers perhaps) is that noise from the train station can be quite loud when the windows are open, though we soon got used to it.
Though we only met Ivan a couple of times during our stay, he was very welcoming and kind. He was very easy to contact when he was away and was always willing to answer any questions we had. By the end we felt very lucky to have had Ivan as our host!