We stayed here for a few nights in April 2018 and thoroughly enjoyed the apartment and the stay in Riga. The apartment is extremely well located - not far from any place you would wish to see over the course of a few days. Very close you'll find fantastic restaurants very close, great shopping, the opera and tour meeting spots.
Added bonuses: The kitchen is extremely well equipped for those that wish to cook. (There is a grocery store nearby.) If you've been on the road for some time, there is a great washing machine in the apartment. On chilly nights, the bathroom floor is heated.
The communication with Anton and others is fast and reliable both before arriving and during your stay. I would recommend staying here if you want a well-appointed, stylish home-away-from-home in Riga.