brovin, welcome to the forum and may I say that your request for information is likely to attract a variety of suggestions.
Mine would be that you should search the 'net, you will find numerous options available and depending on the 'Star ratings' the costs will reflect on your choice.
Central Paris has many 4 and 5 star hotels, these may not be suitable for your group if finances are limited (unless you can arrange a 'Group Deal') lesser rated establishments may not be as central as you would wish but the 'Metro' system is excellent and should be experienced in any case, (I assume you have not been to Paris before ?).
On a lighter note, I was quite amused when one of my short stays there found me accommodated in the 'KUNTZ Hotel' and I remember thinking that it might be a suitable venue for the likes of our politicians, it might be worth an enquiry and add a little levity to an after dinner conversation in later years.
Quite a comfortable place to stay, although I'm certain there are several cheaper with less endearing titles in or around that vicinity.
Good luck with your search and I do hope you have a most enjoyable stay in the beautiful city of Paris, back to my first suggestion, get on the 'net.