I wanted to stay downtown to avoid taxis and transport. This apartment was very central, close to Republic Square and the Opera, all sorts of amazing restaurants and coffee shops. I was a 15-min walk away from pretty much everything I wanted to see in Yerevan.
The owner was very friendly, willing to help and even drive wherever we wanted to go.
The apartment was well-renovated and fresh, with all the furniture we needed. They had two fridges in the kitchen!
The entrance into the building was a bit narrow (by North American standards!), but you get used to it. If you are European, then it is not narrow at all, for a city center.