Krakow is also great.

both are very reasonably priced.

Prague, I rented a great condo, great location, large, see link. About US$135 per nite. But I next time, I would look into a condo on Castle Hill, as that is where I spent most of my time, and it’s a tram ride or a long walk from the condo I rented, in Josefev (or something like that) just NE of the old town square. Talk to Jiri, he may have something else.
References :
Ji?í Pospíšil
+420 777 555 390

Home Sweet Home
Jindrisska 17
Praha 1
110 00

Skyscanner also have good deals on flights too. So thats worth a try.

Travelsupermarket is good for everything (hotel, flights, insurance).

Lowcostbeds is good for rooms.

teletext, icelolly + otbeach are great sites for weekends away. I found a deal to spain 3 nights, all inclusive including hotel + flight £60 each.

Just goes to show you can get them if you look around.

Good look – I’ve heard Pragues beautiful.

TIP: Fly on weekdays it’ll reduce the overall price drastically.

(for full links of all the things I’ve told you to check just search Google.)

Hope this helps.
References :