Staying at Raimond's was just great.
Flat is clean, spacious and very central (quiet though)! Very good for both business trip or holidays.
Raimond is a great host and I would definitely go back there next time I travel again to Riga! I recommend it.
On a side note, for the lovers of a dark room while sleeping: bring your sleep mask because the room is bright. There are blinds but they are quite transparent and the street lamp just below the window does not help! :)