Greatly appreciate if you can suggest some sightseeing in Seville and Madrid. We have two nights in Seville until Jan 7th and taking train to Madrid for 3 nights. Also which part of city should book for 3 nights in Madrid? Thank you.
Don't you have a guide book? For Sevilla, you could try the website linked below for ideas, since I'm not sure what might interest you. Although the top sights for most are, I guess, the cathedral, the Alcazar and "tapas touring" in the "old city" (roughly the area around the Cathedral, bordered by the river and former tobacco factory). For simply walking around I like barrio (neighbourhood) Macarena which has some sights such as the city wall and parliament, but is more a place for simply pootling about. Across the city, there are various museums, galleries, ancient remains (primarily Italica, just outside the city), and old palaces, etc. but I don't know what sort of thing delights you.
If you are going to Seville you should make sure you see a Flamenco performance. Casa de la Memoria is where my friends and I saw a performance and liked it so much we went back the next night and saw another performance (different dancers).
Not knowing your budget, of course, but I've stayed at Hostal Acapulco a couple of times and it is very conveniently located close to two metro stops (Gran Via and Sol) and overlooks Plaza del Carmen. It is a small, family run hotel and is very simple but clean and comfortable.
If you haven't already, look at the videos on this site and buy one of Rick's guidebooks. Have fun - Spain is a great place to visit!
These are two major destinations. Get the RS Spain book, it has all you’ll need.
Agree with the others, find a guidebook. If $20 is too much, then check the library.
There's info on this site:
TV: https://www.ricksteves.com/watch-read-listen/video/tv-show
Madrid: https://www.ricksteves.com/europe/spain/madrid
Seville: https://www.ricksteves.com/europe/spain/sevilla
Try tripadvisor.com for lodging.