If you are ariving in Fiumicino Airport, the best way to arrive at the apt. is to get the train "Leonardo Express" which arrives in Termini Train Station.
From Termini Train Station you may get the subway, "LINE B" direction REBBIBBIA and get off at stop POLICLINICO, (POLICLINICO is at only two subway stops from Termini).
Once you are at subway station Policlinico, go out of the station and I'll meet you there.

If you arrive at Ciampino airport, the best thing is to get the private bus "Terravision" (cost 8 euro) wich will lead you in Rome at Termini Train Station. From Termini follow the indication listed above.