Just like you said it is Maximo Gomez avenue. Around where ex-president Balaguer's house is. It is brand new. I stayed there in December and they had just opened. It is a pretty nice Courtyard, compared to others I've stayed in. They even have free high speed internet access, which was a big bonus for me. They are pretty close to the Malecon, but not walking distance (a few miles I would say). Their breakfast was included for one person, but if you have more than one party you have to pay for the others and it was very expensive I thought, c onsidering what they offered. It was funny when we were there, my son ordered waffles and the guy that was trying to make them, had to try three times to get them right. Going to El Conde and other areas should not be to difficult either. Just get a taxi.
As to guests (I assume you mean the female kind) I would really doubt that they would allow them in your room without paying for a room for them. As you probably know the Courtyard is a business oriented hotel and I don't think they would want to start out with a bad reputation. Overall I was pretty satisfied with this hotel. BTW the hotel looks nothing like the picture they have at the Marriott website (unless they just re-painted it). Hope this helps.