second home

Short definition from Wiktionary

Noun

1. 1
   A secondary residence: country house
2. 2
   A secondary residence: vacation home
3. 3
   A secondary residence: pied-à-terre
4. 4
   A home of a close relative or friend where one spends a great deal of time or feels welcome.
5. 5
   Any place where one spends a great deal of time away from one's primary home, such as an office, a remote town or a foreign country.