Being Athens a great European capital city, hundreds of hotels are available. Here follow some suggestions:
 
Athens Platinum Rooms and Suites
16 Zagoras str., 11527 Athens, Greece
Tel.: + 30 215 2159777
Fax: + 30 215 2159777
info@athensplatinumroomsandsuites.com
https://www.athensplatinumroomsandsuites.com/

Electra Hotel
5 Ermou street, Syntagmam, 10563 Athens, Greece
Tel: (+30) 210 337 8000, Fax: (+30) 210 322 0310
Reservations: (+30) 210 337 0100
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
https://www.electrahotels.gr/el/

Hotel Crowne Plaza Athens City (Suites)
50 Michalakopoulou Avenue, 11528, Athens, Greece
Fax : +30 210 7278600
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
https://www.cpathens.com/

There are tenths of alternative, very close to the third choice (Athens Hilton, Divani-Caravel Athens and so on) or at the very center close to Electra Hotel (Grande Bretagne, Electra Palace and so on)