Hello. Can I buy a rail ticket at Tokyo station to Sendai at the same day of departure? How are the prices of a roundtrip if anybody knows, and what rail-line can I take. Thanks

Can anyone recommend a nice hotel that is walking distance with suitcase to the station. 10 -15 mins ok , less is best though. And if it’s easy to find this hotel ourselves walking. Or maybe a taxi ? We are not people who want 5 star but not old and cold and 3 Star prob ok. We have stayed in other areas of Japan last year and all the places were very clean, so I doubt any will be terrible. Sounds like we should be able to try many different foods if we stay near and see many shopping malls. Any suggestions from here a aday trip to somewhere or a couple short day trips . Thanks.