Our stay at Sergey's place was very nice. Jūlijs and Sergey were great hosts with fast replies and awesome hospitality (flexible and fast arrangeable checkin/checkout times).
The place is as stated on the page - can't get more central than that, has all the amenities necessary, comfy bed and nice views on the rooftops of Old Town ( one needs to be aware that t get that view you need to work for it - so its 4 floors on a very particular post-war time rebuilt staircase. Good part if u come back drunk u can easily go on all fours and remain almost vertical! :D ).
All in all this is a great place I would definitely come back myself and recommend my friends next time they ask me to suggest a place to stay in Riga.