We had a great time in the apartment, it was very clean, big, spacious, very well thought for a big group of people and well located.
We had our plane arriving early in the morning and I contacted Telmo to ask him if we could leave our bags and he responded right away and let us do an early check in. Every time I send him a message he responded right away. Overall he is a great host and definitely will stay on his apartment next time I'll be in Porto.