I think that most connecting times in Sheremetyevo for Aeroflot are quite long. No need for a visa if you are in transit. There are 4 transit hotels at the airport which range from $64 to $100. They also have hourly rates with a minimum of 4 hours. When flying from the US to Bangkok, which is on the other side of the world, it's a good thing to be able to break up the trip and rest up at Sheremetyevo. Just my opinion.