Nikola's place is great! Not a long walk from the train or bus station, and once you're there, you're so close to everything! See House of the Blackheads, Sv Pētera baznīca, and Nativity Cathedral. Eat at Il Patio and Easy Beer & Burger (self serve alcohol and literally next door).
Great location, clean, and Nikola is very quick to respond. Instructions were completely correct, and it was the perfect place to visit Riga for the first time!