The hotel is located close to the crossing of Lomonosovsky Prospect and Michurinsky Prospect. We suggest you to cross both streets (that is to go to the opposite corner of the crossroad) and take the bus number 111 to the stop Transagenstvo which is located in front of the Sputnik hotel, across the street (you do not need to cross Leninsky prospect). See the map below: how to get to INR from Sputnik.
Note that bus 111 runs not so often. An indicative timetable is:
(from hotel)
5:55
6:17,34,51
7:13,35,57
8:19,52
9:26,59
10:33
11:06,40
12:13,47
13:20,54
14:27
15:01,35
16:09,43
17:05,27,50
18:13,35,58
19:29
20:00,31
21:26
22:16
23:06,56
00:50

Back from Transagenstvo:
...
10:08,41
11:15,48
12:22,52
13:29
14:02,36
15:09,44
16:18,52
17:26,48
18:10,33,56
19:18,39
20:10,41
21:09,59
22:49
23:39
0:29
1:23
from Sputnik to INR