I think Kate's apartment is the best Airbnb experience I have ever had (and i have used Airbnb at least a dozen times all over Europe). The loft is fantastic and a pure pleasure to be in. It is very tastefully and originally furnished, there is plenty of space and lots of light. We had a wonderful time on the rooftop terrace in the evenings too.
The location is quiet and only a short tram ride from the old town. I am sure you can walk too if you like a stroll. What I liked about the location is that you get to experience Riga like a resident rather than milling about the usual tourist traps. You are also on the edge of the Kalnciema district with its wooden houses and a farmers market, and a taxi ride to the airport took us all of 15 minutes! To get to the seaside in Jurmala was also very easy, no longer than 30 minutes by car.
Kate is a helpful and discreet host, she accommodated a couple of special requests we had and was very clear and timely in all her communications. I couldn't have wished for a better host.