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You're welcome :) Feel free to ask if you have more questions.

Add time to get from the station to the university.
+ Yandex maps adds time to wait a train (2 min.)

According to google maps it would take you 40 minutes from Preobrazhenskaya and 50 minutes from Elektrozavodskaya.

Neighborhood is OK, I don't think there's much difference. Red metro line is...

Not a big difference. From Преображенская It would be easier to get to Sokolniki park which is one of the best parks in Moscow (I live in Sokolniki, I know what I'm talking about! :) ) But...