The apartment is just as the pictures and is placed near the center - you can go there by foot, no need to use public transport. The host, Denis, is very friendly, answered the messages quickly and gave clear directions to the apartment. He was very helpful and even replaced the kettle for boiling water with a new one, when I said that the old one is not very clean. The new kettle was perfect, I appreciate Denis' help for that.
Since the apartment is on the first floor, it was a little dark even during day, the window was to the parking lot and another yet building - so there was not a lot of sun.
So, apart some small cleanliness problems (some crumbs in the kitchen), this apartment is very suitable for staying in Riga - it has oven, washing machine and most importantly - it is close to the city center.