Does anybody have a recommendation for a good tax advisor or gestora?

Need to file my 2017 return in Spain. I thought I had found a tax advisor with NML Consultores in Madrid but their non-responsiveness makes it impossible to work with. Hence I am in the unfortunate position of having to find a proper tax consultant last minute.

My tax situation might be a bit unique/special and I would be curious if someone is in a similar situation and has an advisor with expertise in this field:

- I am NOT a US person. Not born there, never been a resident, never held a greencard or similar, not paying US taxes. Have been born in an EU country.
- Operating a US company: a single-member LLC that is considered a disregarded entity by the IRS

Any recommendation would be much appreciated.

Thanks!