I wanted a female dog purely based on size ( i live in an apartment) but then i found out that when they experience heat it might be high maintenance for a first time dog owner? What do you guys think? Is it easy to handle, i heard they bleed and more.
My cocker spaniel is a girl and when she was in heat you hardly noticed it, but every dog will be different, the only high maintence thing would be to keep her away from other dogs whilst she is in season. Dont let it deter you its not that big of a nuisance and if you intend to get her spayed after her first season its only something that you will have to go through once!
Can't tell by your post if your question is more for size or that a female will experience heat. Our breed has a standard for a guide for a perfect example of the dog, but our pet quality come in many sizes. Some are perfect in the 50 - 80 lbs range and this can be quite a difference in their size, but all are golden. Check out the parents and see what their sizes are and be honest with your breeder of what you are looking for. She will know more of what she might have to offer you to be the mature size you are looking for.
Females all come into heat unless you spay them. Your breeder and Vet can help you make the decision of when is the best time to do this. A heat can last up to a month, but only the first 10 days or so will there be bleeding, the rest of the time the female is either in breeding heat or going out of heat, but to be safe she should be kept under constant guard for the full time. Heat is usually not much of a problem if the dog is an only dog in a family if you keep her in her own yard and watch her constantly. When on walks you need to stay away from any other dog unless you know it has been neutered and always keep her on leash when out.
Usually you only need to go through heat once then your female is spayed. So honestly not bad. If you don't spay her you can expect her to come in twice a year.
IMHO either sex can be found in the size you want, both are very friendly and loving. I would read and talk a lot with your breeder about everything you are wanting, and if she doesn't think she can help usually she will refer you to another breeder. Take your time. This pup will be with you a long time and become like a child to you. Make sure you have the time and commitment to make sure your pet has all his/her needs met and you will love her/him with all you can.
My females were all spayed before their first heat as well. Are you planning on spaying her when the vet and breeder recommend? Or not at all? I personally won't have a dog that isn't spayed or neutered, so that part is a non-issue for me.
As for size...I'd be more concerned about the personality match verses size for your companion of hopefully 12-13 years, at least. Goldens are good sized, regardless of sex--so if you are concerned about apartment living with a larger dog, you may want to reconsider the breed, in general. If you do decide to get one, you'll just have to be diligent in exercising and giving her lots of exercise and an outlet for the energy. If your apartment has a weight limit, I would look for a rescue to ensure that you meet that limit--or go with a smaller breed in general. Just because females should weigh in a certain range does not mean that a particular dog can't be larger than average--or smaller for that matter. You surely don't want to fall in love to have her get 10 lbs over the limit and put you in a pickle.
I don't think size really matters in an apartment. What is a couple more pounds of dog really when you are already getting a big dog? I would just get what you want most and don't worry about size! Just pick which gender you really want!