Our stay at Kristiana's place was perfect. We did both self check-in and self check-out, but Kristiana to a place, where she was DJing, so we did meet her there and she was very nice a the place where she was playing was cool. Beside that, Kristiana always quickly responded on messages.
The apartment was clean and exactly the same as on the pictures, tram stops just in front of the building, so getting to city centre (or anywhere else) is easy. I'd recommend this place to anyone travelling to Riga.